Freemium
Coolify
Open SourceSelf-Hosted PaaS · Cloud Platforms
Open-source, self-hosted Heroku/Netlify alternative.
paasself-hosteddeployopen-source
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Self-Hosted PaaS · Cloud Platforms
Open-source, self-hosted Heroku/Netlify alternative.
Pipelines & ETL · Data & Analytics
Modern data orchestrator with strong typing, testing and lineage.
GUI Clients · Database
Open-source database manager for SQL and NoSQL with web and desktop apps.
Pipelines & ETL · Data & Analytics
Analytics engineering: SQL-based transformation workflows with tests.
References · Documentation & Learning
Fast, offline-capable API documentation browser combining 100+ references.
Cheatsheets · Documentation & Learning
Rico's cheatsheets: concise cheatsheets for dozens of tools and languages.
Agent & LLM Frameworks · AI for Developers
Open-source LLM app platform: agents, workflows and RAG (trending).
Markdown · PDF & Documents
Online Markdown editor with live preview and cloud sync.
NoSQL · Database
Modern Redis-compatible in-memory store built for multicore (trending).
Relational · Database
Fast in-process analytical (OLAP) SQL database, like SQLite for analytics.
Search Engines · Database
Distributed search and analytics engine built on Apache Lucene.
Whiteboards & Diagrams · Design & Prototyping
Hand-drawn style virtual whiteboard, ideal for quick diagrams.
Practice & Challenges · Documentation & Learning
Free coding practice and mentoring in 70+ languages.
SQL Tools
Modern PostgreSQL EXPLAIN plan visualizer by Dalibo.
Feature Flags · DevOps
Open-source feature flags and remote config with cloud or self-hosted deployment and per-environment targeting.
Learning & Reference · CSS Tools
Learn Flexbox by guiding frogs to lily pads in a fun game.
Agent & LLM Frameworks · AI for Developers
Drag-and-drop builder for LLM apps and agents on LangChain.
Hosting & Collaboration · Git & Version Control
Community-driven, self-hosted software forge (powers Codeberg).
Courses & Tutorials · Documentation & Learning
Non-profit curriculum with free courses and certifications.
Cheatsheets & Learning · Git & Version Control
Find the right Git commands without searching through man pages.
Hosting & Collaboration · Git & Version Control
Lightweight, self-hosted Git service written in Go.
Hosting & Collaboration · Git & Version Control
Dynamic GitHub profile cards — stats, top languages and streaks rendered as embeddable SVGs.
Editors & IDEs · Development Environment
Cloud development environments that automate prebuilt workspaces.
Learning & Reference · CSS Tools
Learn CSS Grid by watering carrots in an interactive game.