Open source software

So far I think I like this: http://www.digitalvolcano.co.uk/content/duplicate-cleaner  for cleaning duplicate files in a Windows OS.

I love ccleaner (piriform.com) and thank Black Swan Image Works (http://www.bsiw.us/) for introducing me to it.

After two whole years, I still like malwarebytes for sweeping internet bacteria that your paid antivirus didn't get.

Comodo is very effective at blocking malware, although its "Danger, Will Robinson!" messages can be disturbing or annoying.

Open Office (or Star Office) is still my office suite of choice (vs. MS Office with Word, Excel, ect.) after 12 years. But it can be a little buggy, resource hogging and slow to start. For tips on how to remedy this:
Linux - http://the11throck.wordpress.com/2008/01/12/make-openoffice-startup-faster/

http://yamz.wordpress.com/2009/05/12/how-to-make-openoffice-org-go-faster/

Still, I didn't pay for it. As opposed to having paid for it. It hasn't wasted enough of my billable time to justify buying slightly less bloated but limited software that produces over sized files (I can't keep saying bloated).

For an exhaustive discussion of OO being bloatware: http://slashdot.org/story/05/10/27/1425232/OpenOffice-Bloated