Project Borealis, the fan-made Half-Life 2: Episode 3 is still continuing along, with the release of a second performance to test so we can stress-test their work.
Last Epoch, a very promising Action RPG that was funded on Kickstarter already supports Linux, and my recent interactions with their team have been great.
A nice way to end the week, Stardock have given some more updates on Ashes of the Singularity: Escalation for Linux and they said something rather interesting.
Keeping tabs on various open source projects, one I'm quite keen to see progress further is the KKnD and KKnD2 remake. They just recently pushed out a new build to improve it further.
Here's a curious one. Evolvation, a space combat sim from HyperReuts originally supported Linux last year and after going through a revamp Linux support was removed. It's coming back though, as the developer has confirmed.
Lutris, the excellent all-in-one game manager solution is really starting to show off now. The latest beta has some nice improvements to tidy it all up.