Beat me to it.
Avast free/AVG free
Firefox LTS (with FEBE and my old febe backup)
buncha old win7 gadgets
7zip 9.20
ultimate windows tweaker
classic shell
CCCP (combined community codec pack) with media player classic
qbittorrent
vmware player
winamp 2.95
splashtop
notepad2
objectdock (non free, bought)
coretemp
volume2
windowspace
gmail notifier w/ https regfile
miranda IM
skype v5.3
hexchat
wincdemu
macrium reflect free
silverlight
foxit pdf reader 2.1
breakaway audio enhancer
a VBscript to restart the sidebar
skypath
keytweak
ccleaner
defraggler
spacemonger (defunct, bought full version before company died)
speccy
dataram ramdisk
filezilla
fraps
cpu-z
gpu-z
hdtune free
angry ip scanner
activeports
autoruns
prime95
teracopy
fotosizer
jasc paint shop pro 7
furmark
windows 7 xp mode
If I find any of these not installed when I need them I really get in a bad mood, so yeah they are all essential to me.