Derbyboard is a roller derby scoreboard written in Rust using the Rocket web framework. It aims to have high performance and low overhead and thus be usable on even relatively low-powered hardware. It also aims to allow for third-party frontends to interface with it easily using a standard protocol based on DerbyJSON. Note that DerbyJSON support is not currently implemented, but it's definitely a future goal.
This code is still very much prototype-quality and has many missing and user-hostile features. Patches and pull requests are, of course, welcome.