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cbr

There's also the VA administration's VistA [1], open-sourced through regular FOIA requests, and written in MUMPS. [2]

[1] https://en.wikipedia.org/wiki/VistA

[2] https://en.wikipedia.org/wiki/MUMPS

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> written in MUMPS

Be afraid :(

Is it really open source though? Do they take contributions or is it just a source dump to comply with a FOIA?

Looks like it's distributed under Apache 2.0, which means it's open source.

Whether they take contributions or not is not really relevant to open-sourceness -- under an appropriate license anyone can use the source to run their own project with whatever contribution policy they like -- but it looks like the main distributor is indeed open to contributions:

https://www.osehra.org/content/code-contribution

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