mapgraph
Massively Parallel Graph processing on GPUs -- now part of Blazegraph
...://www.blazegraph.com/product/gpu-accelerated/.
The early work was released under the Apache 2 open source license and is available on here at Sourceforge. This work was (partially) funded by the DARPA XDATA program under AFRL Contract #FA8750-13-C-0002 and DARPA Contract #D14PC00029.