Another interesting point is that Conduit (Rust-based implementation of the Matrix homeserver) got a beta release last week.
Staying on topic, Dendrite is written in Rust, meant to be super performant. Stoked for hybrid-P2P via Bluetooth LE for offline usage.
Edit: looks like I got confused. Conduit is written in Rust. Ssenica was right, Dendrite is written in Go. To coffee I go!