Hi Doru,
I've been observing how the graph support in Moose has been developing.
We in IBM Research have implemented a full Pharo implementation of the TinkerPop Blueprints property graph de-facto standard http://www.tinkerpop.com .
I am also completing a Pharo-binding for the Gremlin graph traversal language that I call Glider (What you get when you cross a Gremlin and a Mouse). Its very compact and a bit weird syntactically, but its very powerful. Smells kinda like APL for graphs.
If the community is interested, we could go through the IBM Open Source clearance process in the new year and see if we can contribute.