Discussions and news about gaming on the GNU/Linux family of operating systems (including the Steam Deck). Potentially a $HOME away from home for disgruntled /r/linux_gaming denizens of the redditarian demesne.
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Would run and gun games count? If so, I strongly recommend the Neo Geo Metal Slug games. They're all sold emulated on PC (GOG for the no launcher requirement).
And on a more usual sense of "shooter games", Saints Row The Third (GOG and Humble Bundle) and UNLOVED (original version is a mod of Doom II afaik). And just a note, Saints Rows The Third, from some tests I did a while back, seems to have a memory leak issue in character customization screens when running under default Wine.
Ravenfield for cartoony/low poly acradey fun
Operation Harsh Doorstop for something more like Project Reality
Good ol counter strike
I played way too much Counter-Strike in college, and I don't regret a minute of it. Then I discovered the "that's so unrealistic bro" genre of shooters like Squad, Day-Z, Tarkov, and Arma, I never looked back.
If you are talking about multiplayer :
Many options !