Hi there;
This is a quick list of programs and other stuff that is very usable for game programming which is offered up free of charge and free of royalties.
If you know a tool or other thing that is handy for game programmers, please don't hesitate to add it to this list. Nothing it hosted here, we only link to stuff.
Please note that some programs may be marked as 'Strong Copyleft'. This means that the license of that tool or product may require you to make the game you create free or to copy the license of the product you chose. The GPL is the most famous example of that. So I really recommend to check the licenses before using the stuff I link to.
cfxr

cfxr is a Mac port of DrPetter\'s sfxr. In his own words:
Its original purpose was to provide a simple means of getting basic sound effects into a game for those people who were working hard to get their entries done within the 48 hours and didn\'t have time to spend looking for suitable ways of doing this.
There already was a Mac port, but I felt a sudden urge to make one with a native Mac UI, add some proper save/load, and learn Core Data and Bindings while at it. My version\'s called cfxr (as in \"Cocoa sfxr\").
Note that I\'m not the author of sfxr, I\'ve just ported it. (See also: my announcement blog post)
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