If you want a platform to build and customize your own game worlds with your friends, Lovelace Studio is a good choice. This community-created multiverse platform is an MMO sandbox experience where you can build, cultivate and interact with rich content alongside other people. With AI-powered toolkits, you can define and customize assets, stories and themes, and join or create guilds to foster community engagement. It's got a living history of generative quests and lets you gain recognition or infamy across the interconnected multiverse.
Another possibility is Bezi, a collaborative spatial design tool that speeds up the 3D design process. Bezi lets teams design, prototype and review 3D apps and games fast, with advanced tools like generative AI and real-time collaboration. The platform supports cross-platform development, so it's good for designers, developers and teams working on 3D projects. With features like Figma integration, 3D model import and AR/VR support, Bezi lets you create 3D content fast and efficiently.