ClearSilver (​http://www.clearsilver.net/) is a powerful and flexible HTML templating engine.

Unofficial windows builds of ClearSilver 0.9.14 are also available from ​http://clearsilver.yi.org/ as installers for Python 2.3 and 2.4.

Note: If you have to build the package yourself, be sure to build a thread-safe version of the library. Non thread-safe builds have been reported to not work with Trac in a multi-threaded setup.