There is also https://www.gamingonlinux.com/ that's worth looking at.
Don't forget Steam has quite a few Linux games in the store, and Good Old Games keeps expanding its Linux selection. I have a few games from these two that I play often.
Edit:
Just to add, GOG have started their sales today and there is some free games to be had too. I just grabbed Grim Fandango remake for free, plenty of Linux games to be had on sale too. 8)
Don't forget Steam has quite a few Linux games in the store, and Good Old Games keeps expanding its Linux selection. I have a few games from these two that I play often.
Edit:
Just to add, GOG have started their sales today and there is some free games to be had too. I just grabbed Grim Fandango remake for free, plenty of Linux games to be had on sale too. 8)