Interesting Idea.I thought all software was free?
My preferred free software:
VLC
Mozilla Firefox
XNView
Foxit reader (sort of semi-free only)
Free commander (free, but not as good as TCMD)
Wipeit from Skylark (I do have the old free version !!!)
FreeDOS A free OS !!!
MPXPLAY (Audio player, DOS)
7-ZIP
HX DOS extender
NDN file manager (DOS)
FreeBASIC
MPLAYER see link above
KZIP&PNGOUT
My unpreferred unfree software: XP,Wista,WinZI*,W**RK,WMP,AdobePhotos***,IE,Macro-Ado-Flash