If your games are on Steam, check ProtonDB.
If not, you’re probably out of luck, but check recent Search Engine results. Best to limit results to around last 6 months, otherwise you’ll probably get outdated information. Only a few bigger non-steam multiplayer shooters work, I can only think of Overwatch right now.
free libre open source software.
Basically software by the people for the people controlled and kept in check by the people.