Templeet is one of the most bad project I ever used.
It's very slow, the parsing time is very very important. Don't trust any of their benchmark, they compare apples and oranges when they are not totally stupid.
The syntax is one the ugliest I ever saw, just look at http://linuxfr.org/template/my.tmpl . It's not human readable and if you wan't to use it, you NEED to write that sucky code. Some old users have totally stopped to use it, there's http://didbaba.tuxfamily.org/ http://www.twolife.org/