CheckSystem (formally known as CheckSpace) is a monitoring tool for Win 9x, NT, 2000, XP and 2003 computers and servers. The key features of the product are:

Disk and partition monitor
Directory monitor (disk quota)
NT / 2000 event log monitor
Dr. Watson monitor
Application monitor
CPU monitor
System service monitor
File monitor
Http monitor
TCP/IP connection monitor
Running as system service
Html Report Engine