phpSysInfo is a customizable PHP script that parses various files in /proc and displays them. It will display information about system facts like Uptime, CPU, Memory, SCSI, IDE, PCI, Ethernet, Floppy, and Video. It now has full internationalization support along with customizable templates.
Most of the people want to know the list of debian based linux distributions and live cd's.This is very interesting list i haven't seen any place on the net.
This is having the list of open source software applications in different categories
This is very help full for most of the linux administrators ,Uses and developers