I was pining for oldschool UT recently, and found that Xonotic (https://xonotic.org/ https://xonotic.org/) has done a decent job of filling that void. The play

I was pining for oldschool UT recently, and found that Xonotic (https://xonotic.org/ https://xonotic.org/) has done a decent job of filling that void. The player base is small, and the skill ceiling is extremely high, but it's a shockingly solid piece of work for a free, open source game.