According to the website, TWiki is,
a flexible, powerful, and easy to use enterprise wiki, enterprise collaboration platform, and web application platform. It is a Structured Wiki, typically used to run a project development space, a document management system, a knowledge base, or any other groupware tool, on an intranet, extranet or the Internet. Users without programming skills can create web applications. Developers can extend the functionality of TWiki with Plugins. TWiki fosters information flow within an organization, lets distributed teams work together seamlessly and productively, and eliminates the one-webmaster syndrome of outdated intranet content.
Revision control, access control, templates and variables are a few among TWiki’s many features. A comprehensive list of TWiki features are available on the website homepage. Wikipedia on TWiki’s plugin architecture:
TWiki has a plugin API that has spawned over 300 extensions to link into databases, create charts, tags, sort tables, write spreadsheets, create image gallery and slideshows, make drawings, write blogs, plot graphs, interface to many different authentication schemes, track Extreme Programming projects and so on.
Created in 2008, Foswiki is a fork of TWiki. It was launched due to disagreements about future of the TWiki project.
Interview with TWiki CEO, Jitendra Kavathekar, and CTO, Peter Thoeny