Open Source Tooling for Accessing API Endpoint via SPARQL Federation

Hi community,

long time reader, now my first post.

I am looking for some free tool that I can use to federate a SPARQL query (using e.g. the SERVICE statement) to (at least) one API endpoint (which can be a REST endpoint, or maybe also OData). Alternatively, it would also be OK to have a “wrapper” that facades the API endpoint as a SPARQL endpoint so I can use standard SPARQL federation.

I am aware that there’s some commercial capabilities (e.g. Ephedra in metaphactory, but also features in full-stack tools such as Anzo) – but is there anything free that you know? Any help appreciated!

Thanks,
Thomas