Now that bot-trolling seems to have brought this thread to the front, I might as well add the remark that the latest WinBoard version (currently circulating as 4.5TM, but soon to be released as 4.6.0) has its own built-in tournament-manager function, which should be able to do most standard stuff (round-robin, (multi-)gauntlet, Swiss).
This also supports concurrency, i.e. it can run multiple games of a tourney in parallel.