This site is created with the Unix philosophy! I use shell scripts to compose tools written in different languages.
snip.pyinserts generated HTML into markdown. For example, I use it to generate shell sessions in certain blog posts.
wwz.py, a FastCGI script that serves static content directly out of zip files. For example, the entire /release/0.4.0/test/wild.wwz/ tree, with tens of thousands of files, is a single file on the server.