Assetto Corsa is an outstanding driving simulation for racing enthusiasts.
The value here was placed on realistic vehicle representation and physics, frills were generally avoided, so there is not even a main menu music.

I have a lot of fun finding the right vehicle setup for the countless challenges, so I can recommend it, but without some background knowledge on race car setups, the game can be a bit frustrating as even the bronze medal isn't easy to achieve.

Starship Troopers Terran Command is a beautiful strategy game based on the movies of the same name.

You start on a map and have to defend, capture or destroy bases or important points of interest. Different types of units are available, which in combination form a powerful force and can defeat any opponents.

Compared to its spiritual predecessor called Starship Troopers Terran Ascendancy, it has become easier because there are supplies.
But the original Terran Ascendancy campaign is currently being developed in the Terran Command workshop and almost half of it is already finished.

The old campaign is just as challenging and difficult in the new game as it was back then :-)
One of the best strategy games in a long time and a clear recommendation.

Darkenstein 3D is a very nice Retro-Shooter with a great sense of humor.

The story is pretty cool, the gameplay is fun and challenging but not too hard and the level design and the soundtrack are very atmospheric.

Overall, it is one of the best free games available, maybe the best.