SuiteSparse:GraphBLAS: graph algorithms in the language of linear algebra. For production: (default) STABLE branch. Code development: (non-default) MASTER branch. For a short video intro, see https://youtu.be/Tj5y6d7FegI . The libgraphblas.so is Apache2 licensed, but the MATLAB interface in the GraphBLAS/GraphBLAS folder is now GNU GPL3, and this change is retroactive to all versions of GraphBLAS. - Tim Davis - DrTimothyAldenDavis