Command-line client for WebSockets, like netcat (or curl)
A barebones WebSocket client and server implementation
Realtime application framework (Node.JS server)
An embedded web server
Network library for developing TCP/UDP/SSL/HTTP/WebSocket/MQTT client
A simple server for sending and receiving messages in real-time
A Socket.IO client library for Java
websocket and http client and server library, with TLS support
Whakerpy - A light web application framework
WebSocket & WAMP in Java for Android and Java 8
A Retrofit inspired WebSocket client for Kotlin, Java, and Android