To date, Xbox One hasn't been much of a platform for MMORPGs, but that changes today with the release of Neverwinter.
As announced last month, the Dungeons & Dragons MMO is now available for download on Xbox One. It's a free-to-play game, meaning you can download it and check it out without having to pay a dime. It does, however, require an Xbox Live Gold subscription, although from now until Thursday, April 2, all Xbox Live members--including those with free Silver accounts--can play Neverwinter.
Neverwinter was originally released on PC back in 2013, but, being an MMO, it's been routinely updated since then. GameSpot's updated review from last year noted how it's very possible to reach the level cap without having to spend real-world money.
The Xbox One version of Neverwinter has been updated to integrate with your Xbox Live friends list and support a controller-based interface. It includes all of the base game's content, as well as that of the Tyranny of Dragons expansion.
Publisher Perfect World said last year that Neverwinter's console release was "starting with Xbox One," suggesting a PS4 version could be in the works.