I like how you phrase that more like it is an after-thought to the actual topic of this thread.
Here are some additional ones that I use personally:
AVG Anti-Virus (my favorite free anti-virus, though I personally use NOD32)
Spyware Blaster (run it once and it will prevent future spyware)
CCleaner (full cache and temp file clean)
Pidgin (absolute favorite multi-client messenger)
Open Office (perfectly fine alternative to MS Office)
TrueCrypt (create encrypted virtual drives, or entire partitions)
The Gimp (*Huge* improvement over MS Paint, though still pales in comparison to Photoshop)
Firefox (best and safest web browser, frequently updated, with tons of customizable options)
UXTheme Multi-Patcher (allows for Windows themes that aren't digitally signed by microsoft, without the need for 3rd-party bloatware running in the background)
XMPlay (alternative to Windows Media Player for music... I never could get used to the Windows Media Player)
The Core Media Player (alternative to Windows Media Player (for my videos)... I never could get used to the Windows Media Player)
Azureus (second best bittorrent client, IMO. only uTorrent is better, but being owned by the MPAA makes me not want to use that one)
These are just some of the ones I use *every day*. I love them all... and haven't bought a program in years. Developers like you and me develop excellent PC software, and I must say I am looking forward to Google's Android firmware for mobile phones.