Open source. Open possibilities.

Hoppscotch is an open-source API development ecosystem providing a lightweight alternative to Postman and Insomnia for testing and designing APIs.

C64 Commander is a cross-platform app for Android, iOS, and web that remotely controls and manages a Commodore 64 Ultimate device over your local network.

A self-hosted data API for Douyin and TikTok. It fetches posts, profiles, comments, and playlists, and downloads videos and image albums without watermarks. Features a self-healing identity pool, PostgreSQL archiving, REST API, MCP server, CLI, and a web console.

Parse Server is an open-source backend for Node.js and Express that can be deployed on infrastructure running Node.js. It provides REST and GraphQL APIs, Cloud Code, Live Query, push notifications, authentication, file adapters, and supports MongoDB or PostgreSQL.

Self-hosted media server unifying music, audiobooks, podcasts, and radio with shared playback state. Docker-deployed with a built-in setup wizard and Postgres backend.

An opinionated Node.js/TypeScript framework treating AWS Lambda as a first-class citizen, providing DDD domain events, Unit of Work transactions, RFC 7807 problem handling, and SaaS billing/metering via decorators and types.

A Go-based API service that validates OpenBao (formerly HashiCorp Vault) backup integrity by restoring snapshots and verifying expected secret values.

A modern flat-file CMS for PHP — no database required. Stores content as JSON on disk with Twig templating, 33 built-in collection types, REST API, and a built-in MCP server for AI agents. Designed for web designers and agencies seeking structured content management without the complexity of a database backend.

An unofficial, open-source Python client library for the FINRA API Platform that handles OAuth 2.0 authentication while returning raw httpx responses for the Query, Notification and Submission APIs.

HTTPie CLI is a modern, user-friendly command-line HTTP client designed for testing, debugging, and interacting with APIs and HTTP servers.

Fiber is an Express-inspired Go web framework built on Fasthttp, offering routing, middleware, static file serving, WebSocket and SSE support with a focus on performance and low memory use.

Bruno is an open-source API client for exploring and testing APIs, designed as a lightweight, offline-only alternative to tools like Postman and Insomnia.

Insomnia is an open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC, offering native OpenAPI design, test suites, mocking, a CLI for CI pipelines, and Local, Git or Cloud storage options.

An autonomous crypto trading AI orchestrator built on Model Context Protocol (MCP), featuring multi-agent LLM consensus, agentic backtesting, Telegram command center, and a cyberpunk 3D dashboard with real-time market data visualizations.

An open-source, single-executable Firebase alternative built with Rust and SQLite, featuring type-safe APIs and a WebAssembly runtime.

NocoDB is a free, self-hostable open-source alternative to Airtable that provides a no-code spreadsheet interface for databases.

A community-maintained directory of 730+ free public APIs across 48 categories, with a searchable website and a free JSON API endpoint. Covers animals, anime, finance, geocoding, weather and more.

Posting is a terminal-based HTTP client in the spirit of Postman and Insomnia. It stores requests as plain YAML files, works over SSH, and supports environments, autocompletion, tree-sitter highlighting, Vim keys, custom themes, Python hooks and cURL/Postman/OpenAPI import.

Self-hosted live map for Palworld dedicated servers showing players, bases, Pals, NPCs, and server metrics via Docker. Read-only, no client mods required.