The 3D AI Studio is a good option, with a collection of AI tools to turn text or images into 3D models. The tools include Text to 3D, Image to 3D, AI Texturing and texture generation, all with a few seconds' wait. It's geared to be easy to use and fast, and thus useful to people who need to create 3D models for games, animation and other 3D tasks.
Another option is Immersity AI, which converts 2D imagery and video into 3D with a Neural Depth Engine. It produces detailed depth maps, 2D to 3D conversions and image to 3D conversions, with a credit-based system for pricing. It's geared for advertisers, entertainment industry people, architects and designers, and offers a free version for noncommercial use.
If you want a one-stop shop, 3DFY.ai creates 3D models from text prompts or single images, with options for quad-meshed topology, high-quality UV maps and physically-based rendering materials. It's geared for industries like simulation, e-commerce, gaming and AR/VR, and is designed to make 3D content creation easier and faster.
Last is Depthify.ai, which offers cloud-based and desktop tools to convert 2D photos and videos into 3D spatial content for devices like Apple Vision Pro and Meta Quest. It can handle monocular depth estimation, stereo conversion and spatial encoding, and is useful for computer vision and 3D modeling tasks.