Collection

Open source Developer Tools software

Tools you can read, self-host and fork. Some are free outright, others sell a hosted version of the same code.

n8n

Open source automation platform you can self-host, flexible enough for AI agent workflows without full no-code limits.

Developer Tools NewOpen Source

Ollama

Free, open source tool that runs open-weight AI models entirely on your own machine, with no account and no bill.

AI NewOpen Source

Aider

Open source terminal coding assistant that edits your repo and commits each change, running against any model you point it at.

AI NewOpen Source

Cline

Fully open source coding agent inside VS Code that shows every edit and command for approval, using your own API keys.

AI NewOpen Source

CrewAI

Open source framework for building teams of AI agents with defined roles, a cleaner design for multi-agent systems.

AI NewOpen Source

LangChain

The most established open source framework for building AI agents in code, with the largest surrounding ecosystem.

AI NewOpen Source

Stirling PDF

Self-hosted toolkit performing around fifty PDF operations locally, so documents never leave your infrastructure.

Productivity NewOpen Source

DBeaver

Universal database client supporting essentially every SQL database through one interface, with a free community edition.

Developer Tools NewOpen Source

Zed

Code editor written in Rust with GPU rendering, built for speed and multiplayer editing.

Developer Tools NewOpen Source

Hoppscotch

Lightweight open source API client that runs in the browser, with REST, GraphQL, WebSocket and server-sent events support.

Developer Tools NewOpen Source

PostHog

Product analytics, session replay, feature flags and experiments in one open source platform you can self-host.

Marketing & Analytics Open Source

Penpot

Open source design and prototyping tool that stores files as open standards and can be self-hosted.

Design & Creative Open Source

Sentry

Error and performance monitoring that turns a stack trace into the specific commit, release and user session that produced it.

Developer Tools Open Source

Supabase

Postgres as a backend, with auto-generated APIs, authentication, file storage and realtime subscriptions on top of a database you can take with you.

Developer Tools Open Source

About this collection

Tools you can read, self-host and fork. Some are free outright, others sell a hosted version of the same code.

By the numbers

14 tools match on this page.

How the listings are written

Every entry here was written for this directory rather than copied from the vendor. Each one says what the tool does, who it is a good fit for, and where it stops being one, because a listing that only repeats marketing copy is no use to anyone deciding between three options.

Pricing describes the software itself: free means no payment to use it, a free tier means a plan you can stay on indefinitely with paid tiers above, and paid means there is no free plan. That is separate from whether the listing here was paid for.