A freeware utility which can do a lot of things, something like Snaggit / SnagIt or other shareware crap but this one is completely free. The original site is now defunct unfortunatly.
An even better alternative which is properly open-source and maintained. Get it from http://getgreenshot.org/
Freeware to syncronize your computer clock with NTP server, handy if you are using Windows 2000 or lower or just want an easy way to change how often it synchronizes with the server. (Original found at http://www.spdialer.com/timesync )
OpenSource tool to monitor your average bandwidth usage under linux, requires no X and shows graphs using ASCII-style output. (Source: http://humdi.net/vnstat )