Chameleon compiles templates to Python byte-code. It includes a complete implementation of the Zope Page Templates (ZPT) language and a partial implementation of the Genshi language.
The engine itself performs 10-15 times better than the reference implementation and real-world benchmarks show an overall performance improvement in complex applications of 30-50%.
Works on Python 2.4, 2.5 and 2.6, including Google App Engine.
The code is maintained in a subversion repository:
If you want to contribute or need support, join #repoze on freenode irc or write the mailinglist.