finally, a simple and good template engine
TemplatePower is the first simple yet powerful template engine I encounter. I realise that there may be a lot more out there.
it's much easier to use than for instance FastTemplate because you don't need multiple template files for repeating information. it also parses much faster, though I think only a few people will really notice that.
it is also much more useful than engines like smarty. templates were meant to split up the code and the html, and engines like smarty make a totally new programming language for in the templates, which is not really the purpose behind templates imho.
I can't wait for 2.0 to go stable.
An open, cross-platform journaling program.
A scientific plotting package.