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.

Amplication is an open-source platform for building, maintaining, and scaling backend services. It uses AI-powered automation to generate microservices with APIs, data models, and DTOs, while embedding organizational best practices into live templates.

API Platform is a next-generation web framework installer that scaffolds API-first projects with REST/GraphQL APIs, auto-generated documentation, admin interfaces, and Jamstack client apps built on Symfony and React.

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.

Prettier is an opinionated code formatter that parses code and reprints it with consistent rules, taking maximum line length into account and wrapping when needed. It can run in editors on save, pre-commit hooks, or CI.

Saleor is a GraphQL-native, API-only headless commerce platform designed for scalable and composable e-commerce experiences.

Transform is an open-source polyglot web converter that converts between many data and code formats in the browser. Built with Next.js, it offers per-route transformers and can be self-hosted.

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.

Strapi is a leading open-source headless CMS built in JavaScript/TypeScript, offering visual content modeling, auto-generated REST/GraphQL APIs, roles, media library, i18n, and plugin ecosystem.

React-admin is an open-source frontend framework by marmelab for building browser-based single-page admin applications on REST or GraphQL APIs, using TypeScript, React and Material Design. It ships hooks and components for authentication, routing, forms, validation, datagrids, search, i18n and theming.

Plasm is a typed capability graph (CGS), wire mappings (CML), and path-expression language for agents interacting with real APIs. It includes 42 curated API catalogs, validation before transport, HTTP and MCP hosts, and a remote terminal. Built in Rust with optional Elixir support.

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.

GraphQL.js is the JavaScript reference implementation of GraphQL. It lets developers build a typed schema and execute validated queries against it, works in Node and browsers, ships CommonJS and ESModule builds, and is MIT-licensed under the GraphQL Foundation.

Directus wraps any SQL database with auto-generated REST and GraphQL APIs, a visual management Studio, and a native MCP server for AI agents. It supports granular permissions and self-hosting.

TanStack Query is an async state management library for the web that simplifies fetching, caching, synchronizing and updating server state, with adapters for React, Solid, Svelte and Vue.

Open-source documentation website for Harper, a fullstack serverful Node.js application platform. Built with Docusaurus and hosted at docs.harper.fast. Community contributions welcome via issues and pull requests.

Gatsby is a free, MIT-licensed open-source framework built on React for creating fast websites and apps. It loads data from Markdown, headless CMS, REST or GraphQL sources through source plugins behind a uniform GraphQL interface, and supports per-page SSG, DSG and SSR rendering with built-in code splitting, image optimization and prefetching.

Payload is an open-source, Next.js-native headless CMS and fullstack app framework. It installs into your existing /app folder and provides a TypeScript backend, admin panel, auth, versions and access control out of the box.

Refine Core is an open-source React meta-framework for building CRUD-heavy enterprise apps like admin panels, dashboards and internal tools. It offers a headless architecture with hooks and components for auth, access control, routing, networking, state management and i18n, plus connectors for 15+ backend services.

A comprehensive GraphQL client for TypeScript and JavaScript, supporting frameworks like React, Vue, and Angular with built-in caching and developer tools.