This is really just a disguised way to look for new interesting software
Name some of the software you simply can't live without. That software that you like to have around even if you don't always use it; aka your favorites.
Mine (in no particular order):
. Sunbelt Kerio Personal Firewall
http://www.sunbelt-software.com/Kerio.cfm (former Kerio Personal Firewall, former Tiny Personal Firewal. Yeah. This has been with me for a veeery long time. Still free)
http://mpgravity.sourceforge.net/ (Also with me since version 1 when it was a commercial product)
. ADOM and Nethack's Slash'em
http://www.adom.de/ and http://www.slashem.org/ (I simply will never get bored with these two. Been too many years already.)
. DAEMON Tools
Sorry Linux folks.