Top HTTP-CLIENT GitHub Repositories & Tools (2026)

Open-Source API Development Ecosystem • https://hoppscotch.io • Offline, On-Prem & Cloud • Web, Desktop & CLI • Open-Source Alternative to Postman, Insomnia

The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.

A free, open-source developer workspace. Snippets, notes, HTTP requests, calculations, and dev tools in one local-first app.

Asynchronous, non-blocking HTTP & WebSocket client for the JVM

Your go-to microservice framework for any situation, from the creator of Netty et al. You can build any type of microservice leveraging your favorite technologies, including gRPC, Thrift, Kotlin, Retrofit, Reactive Streams, Spring Boot and Dropwizard.

PHP Curl Class makes it easy to send HTTP requests and integrate with web APIs

Production-ready C++ Asynchronous Framework with rich functionality

Android app to create home screen shortcuts that trigger arbitrary HTTP requests and more

HTTP client library built on SwiftNIO

A minimal, fast, and modern desktop HTTP client built with Rust and Tauri

An opinionated HTTP library for .NET applications built on HttpClient message handlers. Provides request de-duplication, prioritised concurrency limiting, speculative background fetching and optional response caching.

A library for managing concurrent asynchronous operations in .NET. Provides bounded concurrency, priority scheduling and key-based serialization over a single queue, with Task and IObservable APIs.

⬇️ A simple all-in-one CLI tool to download EVERYTHING from a URL (like youtube-dl/yt-dlp, forum-dl, gallery-dl, simpler ArchiveBox). 🎭 Uses headless Chrome to get HTML, JS, CSS, images/video/audio/subtitles, PDFs, screenshots, article text, git repos, and more...

Async network clients, down to the wire

The most intuitive desktop API client. Organize and execute REST, GraphQL, WebSockets, Server Sent Events, and gRPC 🦬