I see good non-programming specific open source tools far more unlikely than programming related ones. There are some good ones, but not many. All of those pro

I see good non-programming specific open source tools far more unlikely than programming related ones. There are some good ones, but not many. All of those projects which you listed are more or less programming or web-content related - for which the domain knowledge is readily available among the people who enjoy working in open source. One needs domain experts in the particular domain to implement successful software. Domain experts are motivated by money, peer reputation, and improvement in ones domain. Two of these are readily available in FOSS projects, and becoming a developer in a reputable FOSS project also improves ones career prospects financially quite considerably. So, for a programmer, participating in a FOSS project is quite appealing. Now take some other domain, like music. First, if ones peers are likely to be more or less ignorant of software development, they really cannot appreciate the effort an expert places on developing a software. They may find it interesting, but not as admirable as progressing in ones own domain. Secondly, while developing software may give insights in ones problem area, it's not directly related to her craft. Take a hypothetical composer - which is a more appreciated thing, him doing a composition, or testing/speccing some new compositional software. Thirdly, domain experts seldom gain any obvious financial benefit or participating in open source software (I'm talking about the dominating dynamics, not special cases).