Here is my list of what I consider some of the best PHP packages in the wild.
- phpBB - Forum software - www.phpbb.org
- adodb lite - Simple database abstraction layer - www.adodblite.sourceforge.net
- PHPProjekt - A really good project management system - www.phprojekt.com
- Flyspray - A great bug tracker, simple and easy to implement - www.flyspray.org
- phpBMS - A comprehensive Business Management System - www.phpbms.org
- Wordpress - A simple yet complete blog software package - www.wordpress.org
- phpDoc - A package to help with documenting your code - http://phpdoc.org/
- jsPHP - A one of the best ways implement Ajax for a PHP Developer - http://www.phpclasses.org/browse/package/2677.html
- CMSMadeSimple - One of the best CMSs out there - www.cmsmadesimple.org
- CakePHP - An A-Class Rapid Application Development package with a strong community - www.cakephp.org
To try out some of these packages check out http://opensourcecms.com, they have demo setups of heaps of CMSs, Forum software, E-Commerce and much more.

mark
August 20th, 2007 at 8:10 am
Can’t say I agree with you about phpBMS. Flyspray looks nice though
August 20th, 2007 at 8:40 am
Yeah, phpBMS takes a bit of getting used to but when you add a services module it becomes really useful for billing time and work.
August 25th, 2007 at 5:03 pm
Hmmmm.. service module, huh? Maybe that was my problem.
Still, you might want to give Quickbooks Simple Start a whirl. They have a free download and it’s WAY better than any similar software I’ve tried.
Not that I don’t love open source PHP apps
August 26th, 2007 at 1:16 pm
Yeah, quickbooks does have some good software.
phpBMS Services Module - http://phpbms.org/forum/viewtopic.php?p=372&sid=7b9a8ad453a6717ed62796d6b63ada41
December 3rd, 2007 at 8:34 am
There is a New PHP MVC Framework with an integrated AJAX CMS at: http://macs-framework.sourceforge.net/