Hellow ^^

Searching the Web brings no result other than Games from 2005, where I guess that kind of games were popular.

Maybe someone has a multiplayer game in mind that uses a mechanic similar to Valorant and CS:GO (maybe without the "you need to stand still to have accuracy" part, and more runnign and gunning)

Quake maybe ?

there's trepang2 for single player and f.e.a.r. combat (community run) for multiplayer if you like that style of game, and cube 2: sauerbraten and Urban Terror are also pretty popular open source (aka freeware) titles