An open-source and non-profit version of something like StackOverflow would be nice. Dependence on one commercial company is risky. The now-defunct C2 wiki had

An open-source and non-profit version of something like StackOverflow would be nice. Dependence on one commercial company is risky. The now-defunct C2 wiki had interesting discussions about software engineering, but couldn't really deal with specific products or languages. Such a tool(s) would probably need to be split or marked to distinguish between formal research, philosophical discussions (such as whether to optimize for programmer heads or machines), and specific languages and tools.