Remember: they are not free to keep forever, you can only play them during the weekend.

Here are the links:

Forza Horizon 5: https://store.steampowered.com/app/1551360/Forza_Horizon_5

Fifa 23: https://store.steampowered.com/app/1811260/EA_SPORTS_FIFA_23

Moonbreaker: https://store.steampowered.com/app/845890/Moonbreaker/

Let's Build a Zoo: https://store.steampowered.com/app/1547890/Lets_Build_a_Zoo/

Source: steam DB (https://steamdb.info/upcoming/free/)