Free
Kysely
Open SourceORMs · Backend
Type-safe SQL query builder for TypeScript, no DSL required.
typescriptsqlquery-builder
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ORMs · Backend
Type-safe SQL query builder for TypeScript, no DSL required.
Agent & LLM Frameworks · AI for Developers
Framework for building LLM applications with agents and chains.
Agent & LLM Frameworks · AI for Developers
Open-source LLM observability: traces, evals and prompt management.
Agent & LLM Frameworks · AI for Developers
Build stateful, multi-agent AI applications as graphs.
Generators · CSS Tools
Interactive CSS Grid layout builder with code export.
Clients & GUIs · Git & Version Control
Simple, powerful terminal UI for Git commands.
Cheatsheets & Learning · Git & Version Control
Interactive visualization game for learning Git branching.
SSL & TLS · Security
Diagnose why Let's Encrypt certificate issuance fails for a domain.
Models & LLM APIs · AI for Developers
Open-source, multi-provider chat UI with agents and artifacts.
Load & Performance · Testing
Google's automated audits for performance, SEO, a11y and best practices.
Internationalization · Frontend
Developer-friendly i18n for React and Node — readable message catalogs, macros and automatic extraction.
Migrations & ERD · Database
Open-source database schema change tracking and deployment.
Models & LLM APIs · AI for Developers
Open-source LLM gateway: one API for 100+ providers.
Models & LLM APIs · AI for Developers
The C/C++ inference engine that runs LLMs everywhere, even laptops.
Agent & LLM Frameworks · AI for Developers
Data framework for connecting LLMs to your data (RAG).
Models & LLM APIs · AI for Developers
Open-source AI chat framework with plugins and agent marketplace.
Load & Performance · Testing
Scalable user load testing written in Python.
Authentication · API Tools
Open-source auth infrastructure with a beautiful admin console — OIDC/OAuth, SSO and user management, self-hostable.
Logs & Metrics · Monitoring & Observability
Horizontally-scalable log aggregation designed like Prometheus.
Programming Languages
Official Lua website with reference manual and source.
Icons · Frontend
Beautiful, consistent open-source icon library with framework packages.
Mobile Backend & Services · Mobile Development
Simple YAML-driven UI testing for iOS and Android (trending).
Email · API Tools
Self-hosted email testing tool with a web UI, catches local mail.
CLI Tools · Development Environment
The classic build automation and task runner present everywhere.