The aim of
sophia is to provide a common API for Semantic Web crates and applications. The story of Rust and the Semantic Web is still young and much is to/can be done. Now with the
sophia_api it is your time to start your own project. The foundations are layed. If your interested in parsers, serializers, querying graphs or web frameworks I'm sure you find something for you. Maybe one of
sophia's open issues is a good place to start.
At the current time where knowledge graphs become more popular, I think Rust has the chance to get a new selling point with novel, efficient applications in the Semantic Web.