WebSocket-Node is described as 'A WebSocket Implementation for Node.JS ( Draft -08 through the final RFC 6455 )' and is an app in the Development category. There are four alternatives to WebSocket-Node for a variety of platforms, including Linux, Mac, Windows, Python and C++. The best alternative is Socket.io, which is both free and Open Source. Other great apps like WebSocket-Node are gevent (Free, Open Source), greenlet (Free, Open Source) and eventlet (Free, Open Source).
Eventlet is a concurrent networking library for Python that allows you to change how you run your code, not how you write it. - It uses epoll or kqueue or libevent for highly scalable non-blocking I-O.