This is a BJJ Scoreboard applications which is written in rust and uses egui library and written in rust. It opens two windows, a control window and a score window, you can fullscreen the scorewindow on an external monitor for spectator viewing.
Go to rust-lang.org/tools/install and follow the directions to get rust toolchain installed. Then just do cargo build --release to compile to release mode... then you will find the application in the target/release folder.