Heard of Zero-K? It's an open source RTS that uses the Spring RTS Engine and it's actually pretty good. They're going to release it on Steam, with a campaign currently under development.
The Dota 2 Dueling Fates update sounds like a rather good one, it may even be enough to get me back into the game.
Ever heard of CS2D? A 2D shooter inspired by Counter-Strike is planning to release on Steam on November 15th with Linux support.
Team Fortress 2, the free to play shooter from Valve has been updated once again with the Jungle Inferno update.
Doki Doki Literature Club is a cute dating-sim where you join a literature club filled with beautiful girls. Except, it's not that at all. Underneath the saccharine pink and typical tropes of the genre, something dark slowly emerges and coalesces into a nightmare.
Continuing on from the first part, Estranged: Act II is now available on Linux. The developer switched from Source to Unreal Engine for the second part as well.
In the mood for another trading card game? Forgotten Lore is another free option and it seems reasonably interesting.
Short on games to sink endless hours into? RPG MO is a free to play MMO that has full Linux support.
The Pirate: Plague of the Dead, from developer Home Net Games, looks like it will have a Linux version at launch.
Uebergame, a free and open source FPS just had a fresh release with new maps, UI updates and plenty more.
First person/text adventure hybrid, The Spicy Meatball Saves The Day has been re-launched with all-new audio, gamepad support, improved controls and more!
Still don't own Outlast? Outlast Deluxe Edition is currently going for nothing on the Humble Store and it supports Linux.
Just a quick tip here: Back to Bed, an interesting and slightly weird puzzle game is currently going for free on Steam.
Burst The Game, a free to play online FPS recently launched into Steam Early Access, the problem was it didn't work on Linux and it was basically the Unreal "Multiplayer First Person Shooter Kit".
What do you get when you cross a MOBA style game with PUBG (PLAYERUNKNOWN'S BATTLEGROUNDS), well Prime Arena apparently. It should see a Linux release in future too.
Need something free for the weekend? Got you covered! Psychonauts is free to grab and own from the Humble Store.
The free-to-play card game got its last batch of special co-op stages earlier this week. You’re now able to experience the full range of themed stages with special cards.
Grab a permanent free copy of Monaco: What's Yours Is Mine on Steam today, the deal lasts until around 5PM UTC.
Relic Hunters Zero is a free game available on Steam that also has the source code available on GitHub.
Robocraft, a free to play game about building robots and going into battle has now left Early Access, here's some thoughts.