Didn't think I'd see anything else interesting today after gremlint, but this seems pretty neat: "Gremlin++ & BitGraph: Implement the Gremlin Traversal Language and A GPU-Accelerated Graph Computing Framework in C++"
https://drum.lib.umd.edu/handle/1903/21916 with source code for Gremlin++ here: https://github.com/bgamer50/Gremlin- and BitGraph here: https://github.com/bgamer50/BitGraph
