For most projects, the tracker provides seed points such as usernames, and keeps track of who retrieved what resources and where they're stashed.
alard takes care of making the tracker run happily. The custom software is a python based HTTP application that sends and receives JSON payloads and uses Redis for the data store; all on top of Debian Linux. The code is hosted on GitHub.
The warriors get the list of current projects from the Warrior HQ. The code is in the warrior-hq repository.