Templess is an XML-based templating system for XML and HTML. The main advantage (depending on your taste, I guess ;) is that it's very simple: it currently has only 5 directives (''content'', ''replace'', ''cond'', ''not'' and ''attr'') and does not allow any logic inside the page. Everything (attribute preparation, macro handling, etc.) has to be done from code, which makes that using Templess guarantees clean templates, and a proper seperation of logic and presentation (although generally you will want an additional layer to handle 'presentation logic', things like which class should things have and such).
Templess is released under a BSD-style ('open source') license.
For more information, see the Trac instance I set up, or email me (johnny at johnnydebris dot net).
There is no full list of changes between the 0.1 and 0.2 versions of Templess, but here is a short summary:
* a lot of small bugfixes in rendering, most notably the behaviour is now stable and tested a lot better * added a 'not' directive to negate 'cond', this makes that the context dict doesn't have to contain duplicate (but negated) information * moved away from using lxml, because of the installation and maintenance burden (although additionally some behaviour became clearer, the .tail property in etree is really quite strange...) * some public API changes and cleanups (see documentation in Trac for a reference)