idl.org
This is the source for intldoomleague.org. It's written using Python, Mako (including XHTML), Javascript, CSS and SQL. It requires ZDStack (the most recent version from SVN), boto, saadmin (something else I wrote), Flask, SMF, and PostgreSQL. Postgres isn't a hard requirement, it's just that saadmin doesn't work with anything else right now. Adding support is trivial, but more effort than none so I haven't done it. Also MySQL won't store anything smaller than a second in its datetime/time fields, so good luck there.
If you don't want the site to be slow, you need to enable a cache daemon. Support for Kyoto Cabinet/Tycoon and SQLite is included, although support for other engines ought to be trivial to add.
IDL.org is in the public domain, so feel free to do whatever you want with it. Note that original copyright holders still retain their copyrights, so the graphics and screenshots are still copyright their creators. Also there are some included things, like Javascript libraries, etc. that are straight out of other projects, so you must abide by whatever their licensing is as well.