I have some software/scripts I have written myself that others may find usefull. The code is freeware, along with the code. Feel free to download and use at your leisure.

Online
This is a php script I wrote that you can run using crontab. It checks any port number, and verifies it is responding and alive. If its down, you can adjust it to wait X number of tries and then send an e-mail. Everything is written to a log file for later debugging.

Online-ping
Almost the same script as above except it is for pings only.

Image resize script
This script uses image magic to create thumbnails of large pictures.