[figglesonrails]

GNU License? What? Your comparison breaks down heavily when you actually consider it. GNU software tends to be competition for proprietary/non-open software. They are substitute products.

Comparing them to music isn't really a good thing to do since you can't find a comparable substitute for Incubus's style and Brandon Boyd's voice, where as I can change out GCC compiler for Solaris Studio, Visual Studio, or ICC any day I want with minimal effort and precisely the same results.