HTMLGen is Robin Friedrich's HTML rendering library written in Python. I have written several packages in the same vein, but none so complete or elegant. It is a GREAT TOOL and I love it to death. Without it, I would be writing exactly what it is. Consequently, it has saved me many, MANY hours of effort.
I had rewritten all my web pages using ZenWeb, my extension to the python utility HTMLGen 2.0. Now ZenWeb is written in Ruby, so I don't use HTMLGen anymore, but I'm thinking of porting it if I get any more frustrated with the Ruby html packages.