If you're looking for a mod.io alternative, Microsoft Azure PlayFab is a broad suite of services that can help game developers create and operate live games more easily across many platforms. It includes services for multiplayer services, live operations, real-time analytics and content management, so it's a good candidate for handling user-generated content and keeping players engaged.
Another good choice is Azure PlayFab. It's a full LiveOps back-end for building and operating live games, with tools for multiplayer services, analytics, live operations and content management. It spans many platforms and game engines, and it has flexible pricing with a free account and pay-as-you-go options, so developers of any size can use it.
If you want an AI-centric approach, Magick is an all-in-one, no-code platform for designing, deploying and managing AI agents, bots and applications. Its document processing abilities, fast prototyping and real-time event-driven responses make it a good choice for creating custom game characters, AI chatbots and other game experiences. That could be a good way to add AI to your game development pipeline.
If you want more advanced AI, Inworld offers a real-time AI engine and content creation studio for building games with dynamic NPCs and changing game worlds. It can integrate with many types of games and has tools for character creation, scene creation and AI voice generation to keep players engaged and immersed in the game.