(via Freeware wiki)
Here is a list of 450+ freeware utilities to solve many of your pressing (and not so pressing) software vexations. Everything from anti-spyware/anti-virus to audio/video tools to office work to programming tools and plenty more.
protect the computer against viruses : AVG Free
password protect a text file : Steganos LockNote
view images in an album folder : Irfanview
see 3d space simulation : Celestia
That’s just a tiny sample of the variety of freeware you can see on the page.