Twisted is an asynchronous networking framework written in python. It is used
by most of the servers, clients and protocols that are part of other Twisted
projects.

- twisted.cred, a pluggable authentication system for servers;
- twisted.enterprise, an asynchronous adapter of Python DB-API 2.0 database
  interfaces;
- twisted.internet, the Twisted event loop;
- twisted.manhole, a debugging service;
- twisted.persisted, a collection of object persistence systems
- twisted.protocols, a collection of simple network protocols and helper
  utilities;
- twisted.python, a set of Twisted programming abstractions;
- twisted.spread, a network transport, serializer and object broker;
- twisted.trial, a unit-testing framework; and

WWW: http://twistedmatrix.com/