Not all the best codes came with a price. We can find excellent ones for free with different kind of licenses: freeware, GPL, LGPL, APL, etc.
Software for windows, Macintosh, Internet, linux, games, websites, and more are all together in this webpage. Just look for what you need (and try a few you dont need just to learn something new) and download it without guilt. It's free!!
Mohawke's Best of the Best Free and Open Source Software Collection