I am currently building a single-node graph database implementing the SPARQL query language. It is written in Rust and is named Oxigraph: https://github.com/oxigraph/oxigraph

I would love to get help, I have a working MVP but there are a lot of work left to get good performances for which I would love help. Some current problems are:

- Very big write amplification (the database size on disk is very large).

- The query optimizer is basically non existent.

- The query evaluation code might be easily optimized further.

There is not yet a lot of developer-focused documentation. Feel free reach out here or on Gitter: https://gitter.im/oxigraph/community