Denyhosts is a great package I found while combating a trend of brute force SSH attacks. The official sourceforge site is located at http://denyhosts.sourceforge.net/
I have bundled the code for this tool into a bluequartz package, and made it available for anyone to use. No charge, just enjoy.
One difference about this package is the way to get it. You need to use bluelinq.
UPDATE: This package is now available from Compass Networks via “newlinq”… (An updated BlueLinq based system.
Go to http://www.compassnetworks.com.au/index.php?page=newlinq for more details. Follow the directions, and register your email address in the BlueLinq tab in your server. (This appears as Software Updates in BlueOnyx).
Once you have registered, you will then see the DenyHosts (and any other freely available applications) in the bluelink tab in your bluequartz box.
Most people will not need to make any changes to the default install. If you are adventurous, you can look at denyhosts.cfg in your /etc directory.
Enjoy!