Heratech

http://www.techhail.com/mobiles/15-must-have-applications-for-maemo-5-ba...

^In this case its top 15 but anyway.

Edit: Just to be clear, this is not my list. Just the first one I have seen online.

dial-a-fix
combofix
spybot
spyware doctor
avg
ccleaner
smitfraudfix
windirstat
defraggler

firefox