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Everything below is free
1. Microsoft Security Essentials
2. Comodo Firewall plus
3. Ccleaner
4. RevoUninstaller
5. Malwarebytes
Macrium Reflect for disk imaging
FBackup4 for file backups
Foxit Reader
To me Ccleaner, RevoUninstaller and Malwarebytes are unique and irreplaceable but there are worthy alternatives for the other applications - I just prefer those.
I know it's not fair to not stay within the parameters of the question but these and a couple more are a must for the systems I set up.

Happy new year and smooth computing to all:)