PlayerUnknown's Battlegrounds and Pro Evolution Soccer 2019 are free for a limited time on the Microsoft Store according to each games listing. This is believed to be part of Microsoft's upcoming X018 event, which has gone live a bit earlier than intended.
At this moment in time its not clear whether this is a full-on giveaway or if each game is just free to play for a limited time. Either way if you have any interest in either game it might be worth claiming them sooner rather than later.
PlayerUnknown's Battlegrounds on the Microsoft Store
Pro Evolution Soccer 2019 on the Microsoft Store