At my previous job I extracted and open sourced quite a few libraries and such, although never the entire application itself. And I don't think anyone really w

At my previous job I extracted and open sourced quite a few libraries and such, although never the entire application itself. And I don't think anyone really would have benefited from open sourcing the application either. The code wasn't all that brilliant, it was hard to run, had a lot of assumptions that would only ever be true for us, and we didn't really want to spend the time fixing/optimising that. Tons of other things to do. Practically we would also have to scrub the commit history, do an audit to make sure we really don't have anything sensitive in there, and stuff like that. One reason I open sourced this stuff was just enlightened self-interest by the way: it enforces "clean" library-oriented programming with clean separations. When I joined there was stuff like "email parser module" which in principle would parse RFC2822 messages, but then would also call models to do a few database things, and nonsense like that. It was all pretty messy, and this hugely improved things.