While surfing out there, I just find some cool PHP Apps which may come handy for you.

1. Tasks Jr by AlexKing
A task management tool similar to ActiveCollab, BaseCamp and TickSpot

2. MythTv
MythTV is a GPL licensed suite of programs that allow you to build the mythical home media convergence box on your own using Open Source software and operating systems. MythTV is known to work on Linux and Mac OS X (PowerPC and Intel). It does not run on Windows.

3. PHP-Java Bridge
The php/Java bridge is an optimized, XML-based network protocol, which can be used to connect a native script engine, PHP, with a Java or ECMA 335 virtual machine. It is more than 50 times faster than local RPC via SOAP, requires less resources on the web-server side, and it is faster and more reliable than communication via the Java Native Interface.

4. Relay Ajax Directory Manager
An excellent PHP+Ajax directory manager script

5. Vanila
A nice and Simple bulletin board script