Another contender is AI Adventure, an open-source text-based RPG foundation that uses sophisticated AI to generate story, imagery and audio in real time. It has infinite customizability and a powerful adventure editor so people can create their own adventures and share them with others. It's good for people interested in interactive storytelling and community-generated content.
For a more casual and social gaming experience, Booom lets you create and customize trivia and social games with AI-generated content. It can handle multiplayer, GIF and video elements, and even streams games to a larger group. Booom's integration with chat and social services like Discord and Twitter means you can play with friends and family.