Comment by gilleain

I've revived a project I started around 20 years ago. It is a kind of graph query description/measurement tool for protein 3D data.

The query engine itself is like a DAG of 'operators', similar to a relational DB (or more like a graph one) with scanners, filters, and matchers.

Very fun, although not at all efficient and probably overengineered for what it does :)