Open source. Open possibilities.

Elysia is an ergonomic TypeScript web framework powered by Bun, focusing on end-to-end type safety and developer experience.

3X-UI is an open-source web control panel for managing Xray-core servers, supporting many proxy and VPN protocols with per-client traffic accounting, multi-node management, subscriptions, bots and a REST API.

Maintains updated lists of public BitTorrent trackers across multiple protocols (HTTP, HTTPS, UDP, WebSocket, I2P, Yggdrasil). Automatically checked and sorted by popularity and latency.

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

Requests is a popular Python HTTP library offering a simple, elegant API for sending HTTP/1.1 requests, with sessions, SSL verification, authentication, proxies, streaming, and automatic decompression.

µWebSockets is a C/C++ HTTP and WebSocket server library with a Node.js binding, offering TLS 1.3, URL routing, pub/sub, and a standards-compliant, fuzz-tested implementation for real-time applications.

oha is a tiny HTTP load generator written in Rust that provides a real-time TUI for monitoring web application performance.

A Winston plugin for the modern-errors library that adds fullFormat() and shortFormat() helpers for improved error logging. It supports configurable stack traces, log levels, nested errors, and JSON-safe output for Node.js applications.

Caddy is an extensible, multi-platform web server written in Go that provides automatic HTTPS by default and supports HTTP/1.1, HTTP/2, and HTTP/3.

Uvicorn is a fast ASGI web server for Python, supporting HTTP/1.1 and WebSockets. It’s designed for async frameworks and can be extended with optional dependencies like uvloop and httptools.

A lightweight CLI tool by Vercel for serving static sites, single-page applications, and files locally, with a built-in directory listing interface and configurable options via serve.json.

Apache Dubbo is a Java-based RPC and microservice framework supporting multiple protocols like Triple (gRPC-compatible), Dubbo2 TCP, and REST, with service discovery, traffic management, observability, and Spring Boot integration.

Asynchronous HTTP client/server framework for asyncio and Python, supporting WebSockets, middleware, and routing.

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

curl is a widely used command-line tool and the libcurl library for transferring data to and from servers using URL syntax, with broad protocol support including HTTP, HTTPS, FTP, SFTP, SMTP, IMAP, MQTT, WebSocket and more.

ping6.it is a web UI for comparing IPv4 vs IPv6 latency and reachability using Globalping and RIPE Atlas probes. It runs ping, traceroute, DNS, and HTTP measurements on the same probes for fair side-by-side comparison.

Refit is a type-safe REST client library for .NET that turns REST APIs into live interfaces, inspired by Square's Retrofit. It supports source generation, HttpClientFactory integration, and testing.

Altair is a batteries-included web framework for Crystal, providing routing, ORM, views, CLI, and security tools for building fast, single-binary web applications.

Starlette is a lightweight ASGI framework for building async Python web services, offering WebSocket support, background tasks, and modular components with minimal dependencies.

aria2 is a lightweight, cross-platform command-line download utility supporting HTTP(S), FTP, SFTP, BitTorrent and Metalink, with segmented downloads, checksum verification and RPC interfaces.