Microsoft has announced the Xbox Live Gold and Xbox Game Pass Ultimate line-up for October.
You will be able to download Aaero, Castlevania: Harmony of Despair, Hover, and Resident Evil: Code Veronica free for the month. Aaero and Hover are available for Xbox One and Xbox Series X/S, while Castlevania: Harmony of Despair, and Resident Evil Code: Veronica X are both playable through backward compatibility.
Aaero will be available through the service for the entire month of October. Hover will be around from October 16 through November 15.