PyTroll [1] (the parent org of SatPy) is one of my favorite examples of a project enabled by the open source model. There are only a handful of folks in each Scandinavian meteorological office that write software for processing satellite data. Open source let them work together without needing formal collaboration agreements (though those did come later).

[1] http://pytroll.github.io/

https://github.com/pytroll/satpy would be a better link. Thanks for posting this, as it gave me some interesting ideas for a project I am working on.

Ok, we changed to that from https://groups.google.com/forum/#!topic/pytroll/8OS5WD8RBY4.

Not sure I understand what you mean by that. Also, as of this comment, I see this on the github page: `Latest commit by djhoese about 8 hours ago`

They mean that it has a closed license until 2022. Either they are objecting to GPLv3 or they don't understand open source licenses.

What's significant about 2022?

Huh, what? The LICENSE file clearly says the project is under GPL. Copyright notice doesn't conflict with that. In fact, the whole idea of "copyleft" used in the GPL is based on traditional copyright.

What exactly are you trying to say?