SourceBans is a free global administration and banning system for Source engine based servers.

When running SourceBans web interface and the SourceMod plugin together, you will be able to instantly ban people from all of the servers you have added into the system. Once you either ban a player from the server, or though the web interface, the specified player will instantly be banned across all of your communities` servers. You will no longer need to add the STEAM Id's of users to all of your servers` config files, and keep the configs synced and updated after each ban.