Bash-Shell.Net

BGPWatch is a program written in Perl to monitor processes being run by users on a system.

BGPWatch was conceived of when I ran a shell hosting business and needed to track what programs users were running and how many things they were running at once. It has since expanded to monitor if unknown users are running processes, have options to e-mail you and kill extra processes or just one of those, and has been tested on both Linux and FreeBSD (and should be able to work on any other Unix with minor tweaking).

BGPWatch can be downloaded here