The available Common Lisp implementations of WebSocket servers are
- clws - clws is a WebSocket server, using IOlib
 - Hunchensocket - Hunchensocket is a Common Lisp implementation of WebSockets realized as an extension to Edi Weitz' excellent Hunchentoot web server
 - Portal - Portal is a portable Common Lisp implementation of WebSockets using usocket
 - websocket-driver - websocket-driver is a WebSocket server/client implementation for Common Lisp