The Games with Gold for May 2019 on Xbox One and Xbox 360 have been announced for the platforms delivering a total of four games. All of the games can be played on Xbox One natively or through Xbox Backwards Compatibility. Xbox 360 players are locked to two of the titles, but their collected games will carry forward to Xbox One if they upgrade.
That's not to say that Xbox 360 can't collect the licenses to play the Xbox One games later of which they can on the Xbox.com Marketplace. The games offer a variety of gameplay content and genres with the details below. Be sure to grab the games that are free with the Gold Subscription during their time of availability or you'll miss out. Keep in mind that while certain release dates are similar for the following games, they will be free during very different periods of time. You can see the GWG games list below.
Marooners Xbox One (Available: Month of May)
The Golf Club 2019 Xbox One (Available: May 16th to May 15th)
Earth Defense Force: Insect Armageddon Xbox 360 (Available: May 1st to 15th)
Comic Jumper Xbox 360 (Available: May 16th to 31st)