cool! you might be interested in graphchi (2012), also designed to do large scale graph operations on a single machine
It looks similar to networkit in that it represents graphs using row oriented memory layout.
I forked networkit for exactly this reason. Columnar memory is much more efficient.
I got to use graphchi/graphlab back in the day (I think I still have the tshirt from the 2013 conference), wish it had caught on more.