Freemium
Kong
Open SourceWeb Servers & Proxies · DevOps
Popular open-source API gateway and microservices management.
api-gatewayproxyplugins
Browse the complete directory — use filters to narrow down.
Web Servers & Proxies · DevOps
Popular open-source API gateway and microservices management.
Programming Languages
Official Kotlin language site: docs, playground and standard library reference.
Orchestration · DevOps
Template-free customization of Kubernetes YAML manifests.
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.
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.
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).
UI Libraries · Frontend
Full-featured React components with hooks and theming out of the box.