Graphulo is a new project with the goal of implementing the GraphBLAS building blocks for graph algorithms on top of Accumulo. It builds upon sparse linear algebra, associative arrays, fuzzy algebra, and distributed arrays defined by D4M.
As of August 1, 2015 - Graphulo Version 1.0 has been released! See GitHub page for instructions.
Official GitHub Page: https://github.com/Accla/graphulo/