We should decide on a license, because without one it is unclear whether anyone is even allowed to use it.
My first suggestion would be MIT, as that is what AiiDA uses (and, as an AiiDA plugin, also aiida-icon). It means anyone can use (including commercially and in closed source projects), share, modify, the only obligation is that the license and copyright has to be included in derivative work.
I would only recommend to make sure that it is compatible with C2SM and EXCLAIM (ETH is fine with it for sure).
Hum, more out of principles, I'm not sure about the "including commercially and in closed source projects" (even though I don't see any commercial or closed source project using it anytime soon).
We should decide on a license, because without one it is unclear whether anyone is even allowed to use it.
My first suggestion would be MIT, as that is what AiiDA uses (and, as an AiiDA plugin, also aiida-icon). It means anyone can use (including commercially and in closed source projects), share, modify, the only obligation is that the license and copyright has to be included in derivative work.
I would only recommend to make sure that it is compatible with C2SM and EXCLAIM (ETH is fine with it for sure).