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There are no free open source software projects that: -have a user base in the same magnitude as commercial competitors (or have no competition at all) -are not predominantly used by programmers -don't have a paid organization as the main contributor (like Mozilla)
Can't believe I didn't think of two of my favorite softwares ever:
Ultrastar: open source Singstar, much better because you can make and add songs for free StepMania: open source Dance Dance Revolution, also better for the same reason