Simulation

Now on offer on Humble Bundle for only €9.99 https://www.humblebundle.com/store/surviving-mars-deluxe-edition

Now on offer in the "7 deadly sims" Humble Bundle for only €10.16 https://www.humblebundle.com/games/seven-deadly-sims

Train Sim World 2 is a Unreal engine-powered simulator, now for free in the Epic games store for a limited time: https://www.epicgames.com/store/en-US/p/train-sim-world-2

Out of Space is a single / multiplayer game about living in space that can be played local or online. On offer on Humble Bundle at the moment for only €6.24.

Incredibly realistic JSBSim physics both in atmosphere and low earth orbit. Most accurate & detailed modelling of the Shuttle - can be flown by NASA manual.

Webots was a pleasure to install and use.