What are some cool tactical shooters? I know that Linux has some good shooters like Xonotic, but I would like something more tactical like Arma, Rainbow Six Siege or CS:GO. It doesnt have to be open source altho this is a big plus. I know about AssaultCube and Urban Terror, but they seem unmaintained/dead.
Ready or not is a promising one that you can find in steam. Protondb lists Linux compatibility with steam proton