diesel is an in-development ORM (Object-Relational Mapper) for Rust. It aims to be a safe and efficient layer between your business logic and the database. In the words of its authors:

Diesel gets rid of the boilerplate for database interaction and eliminates runtime errors, without sacrificing performance. It takes full advantage of Rust's type system to create a low overhead query builder that "feels like Rust".

The primary author of diesel - Sean Griffin - is also a Ruby on Rails committer and maintainer of Active Record, the ORM used in Rails. So when I saw his name in relation to a Rust ORM, I knew I have to check it out. Sean also gave a great talk at PolyConf 16 about ownership semantics (not only in Rust) - Owning Ownership.