Yorg, a free and open source racing game currently in development that seems promising is going to get a big update soon with a number of new features and improvements.
Apparatus, a name I honestly had never heard of until recently is a physics puzzle game developed on Linux. As it turns out, this is a reboot of a game that was popular in the early days of mobile touchscreens.
Barony is a game I hadn't honestly touched in a very long time, which all changed with the Myths & Outcasts DLC that released last month giving new ways to play. It's also now on GOG, so that's great.
It occurred to me today, that no one here at GOL seems to have ever written about the free and open source turn-based survival game Cataclysm - Dark Days Ahead.