Command-line client for WebSockets, like netcat (or curl)
Realtime application framework (Node.JS server)
websocket and http client and server library, with TLS support
HTTP proxy server,support HTTPS & websocket
An embedded web server
Compliant web server for the most demanding of applications
Fast and low latency asynchronous socket server & client C++ library
Just another simple, fast, and resilient open-source WebSockets server
HTTP/WebSocket server C++14 library
arduinoWebSockets
A simple WebSocket server
Bringing Http/Https and WebSockets High Performance servers for PyPy3
Websockets for Laravel
deepstream.io server
Universal Ruby library to handle WebSocket protocol
WebSocket client library built on SwiftNIO
High performance Node.js webserver with a simple-to-use API
Ultra fast and low latency asynchronous socket server & client C#
LaravelS is an out-of-the-box adapter between Laravel/Lumen and Swoole
Network library for developing TCP/UDP/SSL/HTTP/WebSocket/MQTT client
μWebSockets for Node.js back-ends
Coherent, zero-dependency, lazy, simple, GraphQL
socket.io library for golang, a realtime application framework
Eclipse Tyrus is the open source JSR 356 - Java API for WebSocket
JSON-RPC 2.0 implementation over WebSockets for Node.js