Open-source projects built with PostHog

n8n

A source-available workflow automation tool with a visual editor, code steps and a large integration library.

Supabase

A Postgres-based backend platform that bundles a database, auth, auto-generated APIs, storage, realtime and edge functions, available hosted or self-hosted.

AnythingLLM

An app for chatting with your documents using any LLM and vector database, available as a desktop app or a multi-user Docker server.

Cal.diy

The open-source community edition of Cal.com: a scheduling and booking-page tool you can self-host. It is MIT licensed; Cal.com itself has been closed source since April 2026.

Logseq

A privacy-first, open-source knowledge base and outliner that stores notes locally and links them with [[backlinks]].

PostHog

A product analytics platform that also includes session replay, feature flags, experiments and surveys, offered as PostHog Cloud or a self-hosted deployment.

Medusa

A Node.js commerce platform with a built-in framework for building custom online stores, marketplaces and B2B commerce apps.

Langfuse

An open-source platform for tracing, evaluating and managing prompts for LLM applications.

Activepieces

A workflow automation tool with a no-code builder and a TypeScript integration framework, available self-hosted or as a cloud service.

Docmost

An open-source collaborative wiki and documentation tool with real-time editing, spaces, groups and page history.

Formbricks

An open-source survey and feedback tool for in-product and link surveys that you can self-host.