Twisted is a framework, written in Python, for writing networked
applications. It includes implementations of a number of commonly used
network services such as a web server, an IRC chat server, a mail
server, a relational database interface and an object broker. Developers
can build applications using all of these services as well as custom
services that they write themselves. Twisted also includes a user
authentication system that controls access to services and provides
services with user context information to implement their own security
models.