Combat-Simulator is a project mainly written in Scala, it's free.
a simulator for GUPRS combat
How to install
just clone it from GitHub and execute sbt in the top directory. Then, type "update", enter, "run", enter. If it doesn't work, tell me so I can fix it.
What does it do? Basically, you specify two fighters using GURPS rules and this tool lets them fight against each other a few thousand times. Then, it displays average survival stats.