The Top 50 Proprietary Programs that Drive You Crazy — and Their Open Source Alternatives:
http://tinyurl.com/2xju2m
Linux for Business: 50 Apps to Get your Office on Open Source
http://tinyurl.com/2byfme
Top 100 of the Best (Useful) OpenSource Applications
http://tinyurl.com/26nsyj
GNU/Linux alternatives to proprietary software products
http://tinyurl.com/8fxjx6