<h2><a href="https://twistedmatrix.com/">Twisted</a></h2>

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<p>Twisted is an event-based engine for Internet applications, written in

Python. Twisted supports TCP, SSL and TLS, UDP, Unix sockets, multicast,

and serial ports. It also includes a Web server, an SMTP/POP3 server, a

telnet server, an SSH server, an IRC server, a DNS server, and of course

APIs for creating new protocols. It supports integration with GTK+ 2, Qt,

Tkinter, wxPython, Mac OS X (PyObjC) and Win32 event loops.</p>