Found 27th Sep 2017
On Xbox One, Xbox Live Gold members can download Gone Home: Console Edition ($19.99 ERP) for free during the month of October. The Turing Test ($19.99 ERP) will be available as a free download from October 16th to November 15th.
On Xbox 360, starting October 1st, Rayman 3 HD ($9.99 ERP) will be free for Xbox Live Gold members through October 15th. Then on October 16th, Xbox Live Gold Members can download Medal of Honor: Airborne ($19.99 ERP) for free through October 31st.