Yes, IronRDP is written entirely in Rust, but we also have bindings for .NET and the web. We originally developed it for our RDP web client for Devolutions Gateway (https://github.com/Devolutions/devolutions-gateway) but now also support it as an option in Remote Desktop Manager (https://devolutions.net/remote-desktop-manager/).

Devolutions Gateway implements the RDCleanPath extension used to bridge WSS to RDP, making the connection from a web client possible. The same IronRDP core can be compiled to a native client for regular RDP connections outside the browser. There is also some work done for the server, but it's not as advanced as XRDP.