Changelog:
Rewritten with Flutter
Support ipv6 (beta)
Strengthed password
Quick support feature
Hardware codecs H264 / H265 (beta)
AV1 codec
International keyboard (Map mode and translate mode)
Wayland support (beta, known issues #4276 (comment))
Privacy mode (beta, Windows only)
Headless Linux
Virtual display (Windows)
Resolution adjustment
Dark theme
A lot of improvements (#918)
https://rustdesk.com / https://github.com/rustdesk/rustdesk/
I am not sure myself, so the following may be wrong.
In my understanding, the rewrite refers to the RustDesk desktop whose interface appears to have been created with Sciter, which was replaced by Flutter.
https://github.com/rustdesk/rustdesk/discussions/533