Little Software Stats is the first free and open source program that allows software developers to keep track of how their software is being used. It is coded in PHP/MySQL which allows it to run on most web servers.
MAMP is a very easy to install compilation of Apache, PHP and MySQL for Mac OS X. Everything will be installed in one folder. If you want to get rid of it, just move the folder into trash. An easy to use cocoa program to start and stop the servers.