Open source API development ecosystem - https://hoppscotch.io (open-source alternative to Postman, Insomnia)

Scalar is an open-source API platform:　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　🌐 Modern Rest API Client　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　📖 Beautiful API References　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　✨ 1st-Class OpenAPI/Swagger Support

A RWKV management and startup tool, full automation, only 8MB. And provides an interface compatible with the OpenAI API. RWKV is a large language model that is fully open source and available for commercial use.

Official Notion JavaScript Client

A single API for all your integrations.

Local-first Developer Tool to Build, Test, Intercept & Mock API Requests. Requestly is a combination of REST API Client and HTTP Interceptor. It is simple, beautiful and powerful alternative to Postman, Insomnia, Bruno and Charles Proxy.

Developer-first OpenSource API DevTool, Postman/Insomnia alternative.

Messaging APIs for multi-platform

Automated API Testing and Quality Assurance

Utilities to use the Hugging Face Hub API

NodeJS/Browser MTProto API Telegram client library,

⚡️ A fully-featured and blazing-fast JavaScript API client to interact with Algolia.

A user-friendly Node.js / JavaScript client library for interacting with the Twitter API.

Node.js & JavaScript SDK for Binance REST APIs & WebSockets, with TypeScript & browser support, integration tests, beautification & more.

Interact with Twitch's API, chat and subscribe to events via PubSub and EventSub.

Postman for protobuf APIs

A text-based HTTP client in the browser. An interface-less Postman.

Visual Studio Code extension to create and test simple and complex HTTP/s requests

A non-scraping, functional node.js interface to imdb (mirror of gitlab.com/worr/node-imdb-api)

A React-based client application for Shlink