Indie fighting game Rivals of Aether (normally $14.99/£11.99) will be available as a free download from June 16 to July 15.
On Xbox 360, Portal: Still Alive (normally $14.99/£9.99) will be free for Xbox Live Gold members from June 1 to June 15.
And from June 16 until the end of the month, Earth Defense Force 2017 (normally $14.99/£11.99) will be free to download.
As part of May’s Games with Gold line-up, members can download party game compilation Marooners and Comic Jumper for free until the end of the month, while The Golf Club 2019 Featuring PGA Tour is free until June 15.
Last month, Microsoft announced Xbox Game Pass Ultimate. Launching later this year, it’ll combine Xbox Live Gold membership with Xbox Game Pass in one subscription package.