People keep asking me whether I can give them the code used to run this website, and while I've done so in the past, the code is currently in a state where it will not easily run on any other platform, there are no setup scripts or anything similar, I use server modules that are not available on other servers, and I have zero time to give support in any way.
However, after some searching I've found the original module by Peter Hendrix, which was always linked from the rules page but the original site went offline, so here it is:
http://www.evo-league.com/files/misc/WebLeaguev1.1.1.zip
You can probably get this running locally using WAMP (http://www.wampserver.com), to bring something online you'll need your own webspace supporting PHP and a MySQL database.
When you get it running, do not expect this to be like evo-league! This is only the barebone ladder system which you would have to suit to your needs. There may also be much better scripts out there, I have no idea.
Feel free to ask questions below, but please try not to ask me questions in the chat. Thanks!