We've found 54557 games on steam.
Unfortunately, just 15.3% of all games on Steam work on Linux:
A better number can be obtained by looking at the total playtime. 70.5% of all playtime on Steam is in games that work on Linux:
Note: this only includes the playtime of profiles that we've scanned.
Some things to note here:
This site is not affiliated with Wine and/or Steam.