This is a bit of code archaeology for me :) Compiling it is easy, running it is hard, especially without MQL. I think I still remember enough to write up a walkthrough if folks would find that interesting...
Yes.
Personally I've always liked the simple query language Graphd/freebase had. I'm interested to see how the performance is like in comparison to other triple stores
Yes, MQL really was an eloquent query language, especially when writing JavaScript for the browser. For the curious, most of the documentation seems to be gone, but there are a few examples here: https://github.com/nchah/freebase-mql#mql-and-graphql
(Note the graphd release doesn't include the MQL query engine)
It's too bad the MQL query engine wasn't also released. In combination with graphd, it was a really nice system to use.
Wondering: why now? Also - there's a couple patents on these bits iirc; but Apache license here?