Griftlands is another game in development from Klei Entertainment! I apparently missed the announcement, but it looks good and I asked Klei about Linux support.
spaceBOUND recently released on Steam in Early Access, but it needs a wee bit of work before we can see what we think. Shame, because it sounds like it's quite interesting.
The Iron Oath promises to be a 'gritty' RPG set in a dark fantasy world with turn-based tactical battles. It looks damn good and it will have Linux support.
If you're in the mood for an RPG that can be played in single-player as well as online then you might want to take a look at Shroud of the Avatar, as it has a free trial going once again.
Bounty Battle looks extremely fun, with a cast taken from other popular indie games and it's now been fully funded on Fig. They also announced some new character's coming.
Rusted Warfare is quite a fantastic little RTS game with clear inspiration from older RTS titles like Total Annihilation and it just got a huge update.
Astral Traveler, what the developer is calling a 'runner style' racer, where you keep on going and going while dodging obstacles and shooting down enemies is releasing next month, with Linux support.
For those of you after a bit of fun with your friends either locally or online, you might want to take a look at 'Marooners', which recently gained a big free expansion.
The Count Lucanor is a slick looking pixel art adventure game that claims inspiration from classics like Zelda and Silent Hill. It also now has Linux support.
Death Road to Canada, a game about surviving on a road trip against all odds and gigantic swarms of slow zombies. It was updated recently, with a huge free update.
The artillery game that pits entire planets against one another in a solar system had its enhanced edition released earlier in the week. Sadly, it seems that the Linux version has some issues that need sorting out.
I learned about West of Loathing recently from Twitter and it seems like it could be a pretty amusing game, it release with Linux support on the 10th of August.