All Tools

244 open-source tools, curated and cross-referenced.

All (244) AI / ML (16) Analytics (7) Automation (7) CRM & ERP (11) Communication (8) DNS & Networking (8) Databases (25) Dev Tools (9) DevOps & Infra (15) Email Marketing (5) Embeddable (47) Knowledge & Docs (8) LLMs & AI Infra (18) Low-Code (13) Media & Files (11) Monitoring (12) Project Mgmt (7) Scheduling (1) Security & Auth (6) Web & CMS (10)
TensorFlow

End-to-end platform for production ML at scale

AI / ML 188.0K advanced
VS Code (Code-OSS)

Most popular open-source code editor

Dev Tools 168.0K beginner
Hugging Face Transformers

State-of-the-art NLP models, tokenizers, and pipelines

AI / ML 140.0K intermediate
Next.js

React framework for production web apps

Web & CMS 130.0K intermediate
Kubernetes

Container orchestration platform for production workloads

DevOps & Infra 114.0K advanced
Ollama

Run LLMs locally with one command

LLMs & AI Infra 110.0K beginner
D3.js

Data-Driven Documents — the gold standard for web data visualization

Embeddable 110.0K expert
LangChain

Framework for LLM-powered applications

LLMs & AI Infra 100.0K intermediate
Deno

Secure runtime for JavaScript and TypeScript

Dev Tools 100.0K beginner
Excalidraw

Open-source virtual whiteboard with hand-drawn feel

Embeddable 90.0K beginner
PyTorch

Flexible deep learning framework for research and production

AI / ML 87.0K intermediate
Tailwind CSS

Utility-first CSS framework for rapid UI development

Embeddable 85.0K beginner
OpenCV

Real-time computer vision library with 2500+ algorithms

AI / ML 82.0K intermediate
Shadcn/ui

Beautiful copy-paste React components built on Radix UI

Embeddable 80.0K beginner
Hugo

Fastest static site generator

Web & CMS 79.0K intermediate
Supabase

Open-source Firebase alternative on PostgreSQL

Low-Code 78.0K beginner
Bun

All-in-one JavaScript runtime 3x faster than Node.js

Dev Tools 76.0K beginner
Home Assistant

Open-source home automation platform

Embeddable 76.0K intermediate
Llama (Meta)

Meta's family of open-weight large language models

LLMs & AI Infra 75.0K advanced
Mermaid

Diagramming and charting from text definitions

Embeddable 74.0K beginner
Elasticsearch

Distributed search and analytics engine

Databases 72.0K intermediate
llama.cpp

LLM inference in C/C++ for CPU and GPU

Embeddable 72.0K advanced
Docker (Moby)

Container platform for building and running applications

DevOps & Infra 70.0K beginner
Redis

In-memory data structure store for sub-millisecond latency

Databases 68.0K beginner
Hoppscotch

Open-source API development ecosystem

Dev Tools 68.0K beginner
Grafana

Analytics and visualization dashboard platform

Monitoring 66.0K intermediate
Strapi

Leading open-source headless CMS

Web & CMS 66.0K intermediate
Chart.js

Simple yet flexible JavaScript charting library

Embeddable 66.0K beginner
Uptime Kuma

Self-hosted uptime monitoring with beautiful UI

Monitoring 65.0K intermediate
Apache Superset

Data exploration and visualization platform

Analytics 65.0K intermediate
Ansible

Agentless IT automation and configuration management

DevOps & Infra 64.0K beginner
Tesseract OCR

Open-source OCR engine supporting 100+ languages

Embeddable 63.0K intermediate
scikit-learn

Simple and efficient tools for classical ML in Python

AI / ML 62.0K beginner
Caddy

Automatic HTTPS web server and reverse proxy

DNS & Networking 62.0K beginner
Keras

High-level neural network API for fast deep learning prototyping

AI / ML 62.0K beginner
ECharts

Apache's powerful charting and visualization library

Embeddable 62.0K intermediate
Socket.IO

Real-time bidirectional event-based communication

Embeddable 62.0K beginner
AppFlowy

Open-source Notion alternative (offline-first)

Knowledge & Docs 60.0K beginner
Immich

Self-hosted Google Photos alternative

Media & Files 60.0K beginner
Open WebUI

Self-hosted ChatGPT-like interface for local LLMs

Embeddable 60.0K beginner
Prometheus

Monitoring and alerting toolkit

Monitoring 57.0K intermediate
n8n

Fair-code workflow automation with 400+ integrations

Automation 55.0K intermediate
Zed

GPU-accelerated multiplayer code editor in Rust

Dev Tools 55.0K beginner
Traefik

Cloud-native reverse proxy and load balancer

DNS & Networking 53.0K beginner
NocoDB

Open-source Airtable alternative

Low-Code 52.0K beginner
Pi-hole

Network-level DNS ad and tracker blocker

DNS & Networking 51.0K beginner
Meilisearch

Lightning-fast typo-tolerant search engine

Databases 50.0K beginner
MinIO

S3-compatible high-performance object storage

Databases 50.0K intermediate
Astro

Content-focused web framework with zero JS default

Web & CMS 50.0K intermediate
pdf.js

Mozilla's PDF viewer for the browser

Embeddable 50.0K beginner
Appwrite

Backend platform for web, mobile, and Flutter

Low-Code 48.0K beginner
Ghost

Modern open-source publishing and newsletter platform

Web & CMS 48.0K intermediate
Gitea

Lightweight self-hosted Git service

DevOps & Infra 47.0K beginner
Joplin

Open-source note-taking with E2E encryption

Knowledge & Docs 47.0K beginner
FFmpeg

Universal multimedia processing engine

Embeddable 47.0K advanced
vLLM

High-throughput LLM serving engine

LLMs & AI Infra 45.0K advanced
AFFiNE

All-in-one workspace for docs and whiteboard

Knowledge & Docs 45.0K beginner
PocketBase

Backend in a single file with admin UI

Low-Code 44.0K beginner
Quill

Modern WYSIWYG rich text editor

Embeddable 44.0K beginner
Discourse

Open-source forum platform

Communication 43.0K intermediate
Rocket.Chat

Open-source team-chat platform

Communication 42.0K intermediate
Vaultwarden

Lightweight Bitwarden-compatible password server

Security & Auth 42.0K intermediate
Monaco Editor

VS Code's code editor for the browser

Embeddable 42.0K intermediate
Leaflet

Lightweight interactive maps library

Embeddable 42.0K beginner
Streamlit

Build data apps in Python with minimal code

AI / ML 40.0K beginner
ClickHouse

Column-oriented OLAP database for real-time analytics

Databases 40.0K advanced
Odoo Community

Modular open-source ERP and business suite

CRM & ERP 40.0K intermediate
Metabase

Business intelligence anyone can use

Low-Code 40.0K beginner
Kong

Cloud-native API gateway and service mesh

Dev Tools 40.0K beginner
Mistral

Efficient open-weight LLMs for edge and cloud

LLMs & AI Infra 38.0K advanced
Apache Airflow

Programmatic workflow orchestration for data pipelines

Automation 38.0K intermediate
Jellyfin

Free media streaming system

Media & Files 38.0K beginner
AutoGen

Microsoft's multi-agent conversation framework

LLMs & AI Infra 38.0K intermediate
Ruff

10-100x faster Python linter and formatter

Dev Tools 38.0K beginner
Video.js

Web video player framework

Embeddable 38.0K beginner
Gradio

Build ML web demos in minutes with Python

AI / ML 37.0K beginner
Whisper.cpp

Port of OpenAI Whisper speech recognition to C/C++

Embeddable 37.0K intermediate
Istio

Service mesh for microservices traffic management and security

DevOps & Infra 36.0K expert
PhotoPrism

AI-powered self-hosted photo management

Media & Files 36.0K intermediate
Tesseract.js

Pure JavaScript OCR engine running in browser and Node.js

Embeddable 36.0K beginner
Appsmith

Low-code platform for internal tools

Low-Code 35.0K beginner
Penpot

Open-source design and prototyping platform

Media & Files 35.0K beginner
uv

Extremely fast Python package and project manager

Dev Tools 35.0K beginner
Pandoc

Universal document converter between markup formats

Embeddable 35.0K intermediate
Cal.com

Open-source scheduling infrastructure

Scheduling 34.0K intermediate
ToolJet

Low-code platform for building business applications

Low-Code 34.0K beginner
JAX

Composable transformations of NumPy for high-performance ML research

AI / ML 32.0K expert
Milvus

Cloud-native vector DB for billion-scale AI search

LLMs & AI Infra 32.0K intermediate
Plane

Modern open-source project management

Project Mgmt 32.0K beginner
Payload CMS

Next.js-native headless CMS and app framework

Web & CMS 32.0K intermediate
Vault

Secrets management and data encryption platform

DevOps & Infra 31.0K advanced
Mattermost

Open-source team-chat platform

Communication 31.0K intermediate
Detectron2

Meta's platform for object detection and segmentation

AI / ML 31.0K advanced
spaCy

Industrial-strength NLP with pre-trained pipelines

AI / ML 30.0K beginner
CockroachDB

Distributed SQL for global cloud-native applications

Databases 30.0K advanced
Outline

Beautiful wiki and knowledge base

Knowledge & Docs 30.0K beginner
InfluxDB

Purpose-built time-series database

Databases 30.0K intermediate
OpenTelemetry

Vendor-neutral observability framework for metrics, traces, and logs

Monitoring 30.0K intermediate
Directus

Open data platform wrapping any SQL database

Low-Code 30.0K beginner
Tiptap

Headless rich text editor framework built on ProseMirror

Embeddable 30.0K intermediate
Slate

Customizable framework for building rich text editors

Embeddable 30.0K advanced
Sharp

High-performance Node.js image processing

Embeddable 30.0K beginner
K3s

Lightweight Kubernetes for edge and IoT

DevOps & Infra 29.0K intermediate
Apache Kafka

Distributed event streaming platform

DNS & Networking 29.0K intermediate
Editor.js

Block-style editor with clean JSON output

Embeddable 29.0K beginner
DuckDB

In-process analytical database (SQLite for analytics)

Databases 28.0K beginner
Medusa

Open-source headless commerce engine

Web & CMS 28.0K intermediate
Nextcloud

Self-hosted productivity platform

Media & Files 28.0K beginner
CodeMirror

Versatile code editor component for the web

Embeddable 28.0K intermediate
LocalAI

Drop-in OpenAI API replacement running locally

Embeddable 28.0K intermediate
MongoDB

Document-oriented NoSQL database for flexible schemas

Databases 27.0K beginner
Dragonfly

Modern Redis-compatible in-memory store with 25x throughput

Databases 27.0K intermediate
Redash

Connect to any data source, visualize, and share

Analytics 27.0K intermediate
AdGuard Home

Network-wide ad and tracker blocking with DNS-over-HTTPS

DNS & Networking 27.0K intermediate
Plyr

Simple, accessible HTML5 media player

Embeddable 27.0K beginner
Wiki.js

Powerful modern wiki platform

Knowledge & Docs 26.0K beginner
SiYuan

Privacy-first local-first block-based note-taking

Knowledge & Docs 26.0K intermediate
FreeRTOS

Real-time operating system for microcontrollers

Embeddable 26.0K expert
CrewAI

Multi-agent AI orchestration framework

LLMs & AI Infra 25.0K intermediate
Tabby

Self-hosted AI coding assistant

LLMs & AI Infra 25.0K intermediate
Podman

Daemonless rootless container engine by Red Hat

DevOps & Infra 25.0K intermediate
Umami

Simple, fast, privacy-focused website analytics

Analytics 25.0K intermediate
Celery

Distributed task queue for Python

Embeddable 25.0K intermediate
OpenTofu

Open-source Terraform fork for infrastructure as code

DevOps & Infra 24.0K intermediate
GitLab CE

Complete DevOps platform with built-in CI/CD

DevOps & Infra 24.0K intermediate
Loki

Log aggregation system by Grafana Labs

Monitoring 24.0K intermediate
Twenty

Modern open-source CRM alternative to Salesforce

CRM & ERP 24.0K intermediate
Jitsi Meet

Open-source video-conferencing platform

Communication 24.0K intermediate
PostHog

All-in-one product analytics platform

Analytics 24.0K intermediate
Keycloak

Open-source IAM and SSO platform

Security & Auth 24.0K intermediate
Jenkins

Extensible open-source CI/CD automation server

DevOps & Infra 23.0K intermediate
Budibase

Low-code platform for business apps in minutes

Low-Code 23.0K beginner
Passport.js

Simple authentication middleware for Node.js

Embeddable 23.0K beginner
Qdrant

High-performance vector similarity search engine

LLMs & AI Infra 22.0K intermediate
Continue

Open-source AI code assistant for any IDE

LLMs & AI Infra 22.0K beginner
Zulip

Open-source threaded-chat platform

Communication 22.0K intermediate
Plausible

Lightweight privacy-first web analytics

Analytics 22.0K intermediate
Typesense

Fast typo-tolerant search engine with simple API

Databases 22.0K beginner
Pulumi

Infrastructure as code using real programming languages

DevOps & Infra 22.0K intermediate
Focalboard

Open-source Trello/Notion/Asana alternative

Project Mgmt 22.0K beginner
Chatwoot

Open-source customer engagement platform with live chat widget

Embeddable 22.0K intermediate
Jaeger

Distributed tracing system

Monitoring 21.0K intermediate
ERPNext

Full-stack business management platform

CRM & ERP 21.0K intermediate
Saleor

GraphQL-first headless e-commerce platform

Web & CMS 21.0K intermediate
MLflow

Open-source AI platform for agents, LLMs & ML models

AI / ML 20.0K intermediate
Qwen3

Alibaba's open LLM family with hybrid thinking modes

LLMs & AI Infra 20.0K advanced
SigNoz

Full-stack APM and observability platform

Monitoring 20.0K intermediate
Node-RED

Flow-based programming for IoT and APIs

Automation 20.0K intermediate
Matomo

Privacy-friendly full-featured web analytics

Analytics 20.0K intermediate
Kibana

Visualization and exploration for Elasticsearch data

Monitoring 20.0K intermediate
WeKan

Open-source Kanban board

Project Mgmt 20.0K beginner
Lexical

Meta's extensible text editor framework for React

Embeddable 20.0K advanced
Sonic

Fast lightweight search backend

Embeddable 20.0K intermediate
MicroPython

Python for microcontrollers and constrained systems

Embeddable 20.0K beginner
TimescaleDB

Time-series extension for PostgreSQL

Databases 18.0K intermediate
Infisical

Modern open-source secret management for teams

DevOps & Infra 18.0K beginner
Huly

All-in-one team platform replacing Jira+Slack+Notion

Project Mgmt 18.0K beginner
ArgoCD

Declarative GitOps continuous delivery for Kubernetes

DevOps & Infra 18.0K advanced
Prefect

Modern Python-native workflow orchestration

Automation 18.0K intermediate
Haystack

Framework for building NLP and RAG pipelines

Embeddable 18.0K intermediate
Chroma

AI-native open-source embedding database

LLMs & AI Infra 17.0K intermediate
Biome

Extremely fast unified formatter and linter for JS/TS

Dev Tools 17.0K beginner
Listmonk

High-performance self-hosted newsletter manager

Email Marketing 16.0K intermediate
BookStack

Simple self-hosted wiki with books/chapters/pages

Knowledge & Docs 16.0K beginner
NATS

High-performance cloud-native messaging system

DNS & Networking 16.0K intermediate
DeepSeek V3

Frontier open-source reasoning LLM with MoE architecture

LLMs & AI Infra 15.0K advanced
Postal

Open-source mail delivery platform

Email Marketing 15.0K intermediate
authentik

Modern self-hosted identity provider

Security & Auth 15.0K intermediate
NocoBase

No-code/low-code platform for business applications

Low-Code 15.0K beginner
Kubeflow

ML toolkit for Kubernetes-native model training and serving

AI / ML 14.0K expert
ArangoDB

Multi-model database: document + graph + key-value

Databases 14.0K intermediate
ScyllaDB

High-performance Cassandra-compatible database

Databases 14.0K advanced
Apache Druid

Real-time analytics database for event-driven data

Databases 14.0K advanced
Cachet

Open-source status page system

Monitoring 14.0K intermediate
Baserow

No-code database and Airtable alternative

Low-Code 14.0K beginner
SuperTokens

Open-source authentication for web and mobile apps

Security & Auth 14.0K intermediate
Neo4j Community

Native graph database with Cypher query language

Databases 13.0K intermediate
Temporal

Durable workflow execution platform for microservices

Automation 13.0K intermediate
RabbitMQ

Message broker with multiple protocol support

DNS & Networking 13.0K intermediate
Audacity

Multi-track audio editor and recorder

Media & Files 13.0K beginner
Tantivy

Full-text search engine library inspired by Lucene

Embeddable 13.0K advanced
Weaviate

AI-native vector database with semantic modules

LLMs & AI Infra 12.0K intermediate
Activepieces

Open-source no-code automation for business

Automation 12.0K intermediate
KeyDB

Multi-threaded Redis fork by Snapchat

Databases 12.0K intermediate
Windmill

Developer-first internal tool and workflow engine

Automation 12.0K intermediate
ImageMagick

Swiss army knife of image processing

Embeddable 12.0K intermediate
Element / Matrix

Open-source encrypted-messaging platform

Communication 11.0K intermediate
Shotcut

Free cross-platform video editor

Media & Files 11.0K intermediate
Zephyr RTOS

Modern RTOS for connected, resource-constrained devices

Embeddable 11.0K expert
OpenProject

Enterprise project management with Gantt charts

Project Mgmt 10.0K beginner
Kedro

Framework for production-quality, reproducible data science code

AI / ML 10.0K intermediate
Text Generation Inference

HuggingFace production-grade LLM serving

LLMs & AI Infra 10.0K advanced
FerretDB

MongoDB-compatible proxy using PostgreSQL backend

Databases 10.0K intermediate
OpenSearch

Community-driven Elasticsearch fork by AWS

Databases 10.0K intermediate
Formbricks

Open-source survey and experience management

Low-Code 10.0K beginner
Lucia

Lightweight authentication library for TypeScript

Embeddable 10.0K intermediate
Apache Cassandra

Distributed wide-column NoSQL for zero downtime

Databases 9.0K advanced
Mailcow

Dockerized self-hosted email server suite

Communication 9.0K advanced
ESPHome

Configuration-based firmware for ESP devices and Home Assistant

Embeddable 8.7K beginner
Taiga

Agile project management for cross-functional teams

Project Mgmt 8.0K beginner
Docmost

Polished Notion/Confluence replacement

Knowledge & Docs 8.0K beginner
Metaflow

Human-friendly ML lifecycle framework from Netflix

AI / ML 8.0K intermediate
SGLang

Fast serving framework for LLMs and vision-language models

LLMs & AI Infra 8.0K advanced
BigBlueButton

Web conferencing for online education

Communication 8.0K advanced
ProseMirror

Toolkit for building rich text editors from scratch

Embeddable 7.5K expert
Mautic

Open-source marketing automation platform

Email Marketing 7.0K intermediate
H2O.ai

Distributed AutoML platform for enterprise machine learning

AI / ML 7.0K intermediate
Heyform

Open-source conversational form builder

Low-Code 7.0K beginner
OpenCart

Open-source shopping cart and e-commerce platform

Web & CMS 7.0K beginner
MapLibre GL JS

Open-source fork of Mapbox GL JS for vector maps

Embeddable 7.0K intermediate
BullMQ

Premium job queue for Node.js based on Redis

Embeddable 7.0K intermediate
MariaDB

MySQL fork with enhanced features and community governance

Databases 6.0K beginner
Dolibarr

ERP and CRM for SMBs and freelancers

CRM & ERP 6.0K beginner
CouchDB

Document database with HTTP API and multi-master sync

Databases 6.0K beginner
Mailtrain

Self-hosted newsletter app with automation

Email Marketing 6.0K intermediate
Phi-4 (Microsoft)

Compact but powerful reasoning model with MIT license

LLMs & AI Infra 5.0K advanced
Zabbix

Enterprise-class infrastructure monitoring

Monitoring 5.0K intermediate
Woodpecker CI

Community fork of Drone CI for container-native builds

DevOps & Infra 5.0K intermediate
OneUptime

Complete open-source reliability platform

Monitoring 5.0K intermediate
Leantime

Project management designed for non-project-managers

Project Mgmt 5.0K beginner
Zammad

Full-featured helpdesk and ticketing system with live chat

Embeddable 5.0K intermediate
SuiteCRM

Enterprise-grade open-source CRM

CRM & ERP 4.0K intermediate
Lightdash

BI tool built for dbt users

Analytics 4.0K intermediate
Cron / node-cron

Cron-like job scheduler for Node.js

Embeddable 3.0K beginner
Nagios Core

IT infrastructure monitoring with 4000+ plugins

Monitoring 2.0K intermediate
Tiledesk

Open-source AI agent builder and live chat platform

Embeddable 2.0K intermediate
EspoCRM

Lightweight self-hosted CRM for teams

CRM & ERP 1.8K beginner
YetiForce

Customizable CRM/ERP with 80+ modules

CRM & ERP 1.8K intermediate
Krayin

Laravel-based open-source CRM

CRM & ERP 1.5K intermediate
Corteza

Privacy-first low-code CRM with data sovereignty

CRM & ERP 1.5K intermediate
metasfresh

ERP for distribution and warehouse management

CRM & ERP 1.5K intermediate
Keila

Open-source email newsletter platform with privacy focus

Email Marketing 1.5K intermediate
Axelor

Open-source ERP with BPMN low-code platform

CRM & ERP 1.0K intermediate
PostgreSQL

The world's most advanced open-source relational database

Databases intermediate
MySQL

World's most popular open-source relational database

Databases beginner
SQLite

Embedded serverless database in a single file

Databases beginner
WireGuard

Modern fast VPN tunnel with minimal attack surface

Security & Auth intermediate
pfSense

Open-source firewall and router platform

Security & Auth advanced
WordPress

Most popular open-source CMS powering 40%+ of the web

Web & CMS beginner
GIMP

GNU Image Manipulation Program

Media & Files beginner
Inkscape

Professional vector graphics editor

Media & Files beginner
Blender

Complete 3D creation suite

Media & Files intermediate
LibreOffice

Free office productivity suite

Media & Files intermediate
Nginx

High-performance HTTP server and reverse proxy

DNS & Networking intermediate