My favorite open source - free PhP scripts

Banner Rotation - Administration :
phpAdsNew
http://phpadsnew.com/

Email :
phpMailer
http://phpmailer.sourceforge.net/

Web Server Statistics (Apache)
AWSTATS ( actually it is a Perl script but it is a must)
http://awstats.sourceforge.net/

File manager :
File Upload Manager 1.3
http://webdev.mtnpeak.net/index.php?pg=php

MySQL database administration :
phpMyAdmin
http://www.phpmyadmin.net/

Cool, some nice links there! Have been looking for something to rotate banner ads for a while! Thanks :)

phpAdsNew rules!  :)

Haha yea those scripts are amazing, I use most of them especially phpMyAdmin.