Chouwa is a library that aims to ease the integration of Jinja2 into Django projects. It does this by providing equivalents of some of django's helper methods that depend on its template subsystem, as well as providing built-in globals and filters and providing a mechanism for user applications to introduce their own globals and filters.
pyratemp is probably (one of) the smallest complete template-engines for Python (with about 500 LOC). It has a very small set of special syntax in the templates. This reduces complexity and the probability of bugs and lead to an easy-to-use and intuitive user-interface. It uses embedded Python-expressions (in a "sandbox"), is well documented, has full Unicode-support, and produces very good error-messages, which is very useful when creating new templates.
Cloud User Shell (cush) is a multi-call executable bringing RESTful cloud control to the command line, combining many useful cloud computing utilities into a single executable. It follows the Unix philosophy of writing components that work together, do one thing and do it well, and communicate over text (HTTP) streams. It is also RESTful, clearly delineating the 3 sides of the REST Triangle: verbs (e.g. GET), nouns (e.g. http://samj.net/), and content types (e.g. text/html).
txOpenID is an implementation of the OpenID Identity Provider specification, written using Twisted Web and Divmod's Nevow. It reads authentication data and user Web sessions out of a MySQL database using MySQLdb and Twisted Enterprise's adbapi layer. txOpenID currently supports version 1.1 of the OpenID specification.