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LibreOffice? Eigen (perhaps not "popular" unless you're interested in doing linear algebra with C++.. :-/ )? Surely there are others as well.. If you want a

by jabl 11y ago

LibreOffice? Eigen (perhaps not "popular" unless you're interested in doing linear algebra with C++.. :-/ )? Surely there are others as well.. If you want a weak copyleft license, IMHO MPL-2.0 is about the best available at the moment, and relatively easy to follow.