Gotcha

This is an awesome program that runs locally on your PC.

http://www.gotcha-antihack.com/index.php/about-gotcha

Feature List:
Scheduled messages announced to server
Banning players for: Hacked items, Teleporting
Timer for automatic server restart
Playerlist
Eventlogging
Manage local bans
Simplified use of all rcon commands
Whitelist - Just allow certain players to join your server!