Developer website: Mr. Gecko
Password Practice is a simple way to practice your password, memorize your password, and improve your typing speed of your password. Password Practice is put in the Public domain at https://opensource.mrgeckosmedia.com/ and is a great way to learn how programming on the Mac is.
MD5 of the current one is c48c80f3358dca4728dca6c6877709a0 if you trust me. If you don't trust me, download the source and compile it.
Mac OS X 10.4 or later