Twisted is an asynchronous networking framework written in Python, supporting TCP, UDP, multicast, SSL/TLS, serial communication and more. It is used by most of the servers, clients and protocols that are part of other Twisted projects.

A full API reference of Twisted and all subprojects is available.

Twisted contains a number of modules:

• twisted.cred, a pluggable authentication system for servers;
• twisted.enterprise, an asynchonous adaptor 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 persistance 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

Twisted is available under the  MIT Free Software licence.