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throwaway_molotov wrote

RethinkDB was built by an open source startup. They couldn't monetize it at scale, but the team did a great job of open sourcing and documenting everything when they shut down. This included previously proprietary extensions offered under an enterprise license. The community picked it up an ran with it.

More like software ER rather than software necromancy. That being said, there are whole industries of specialists who are brought in to resurrect dead software projects that are still used in production. For example, rewriting an existing COBOL project in C++ with matching byte for byte output (since that's what the factory hardware expected).