If you're looking for a site to explore and share AI art, Civitai is a good place to start. It's got a huge collection of high-quality Stable Diffusion models, and the community-run site has curated models you can filter by your preferences. Civitai also has shared and discussed models, tutorials, tips and community posts, so it's a good place to learn and get better at generative AI. Membership is free or ranges from several tiers of paid subscriptions that help fund the site's operations and development.
Another interesting site is Artbreeder, which is geared more toward collaborative creativity with AI tools like Composer and Collager. The service lets you remix and expand on others' work, with millions of images to explore and daily challenges. Artbreeder uses GANs like BigGAN and StyleGAN and has a core set of free features and a premium subscription for faster rendering, higher resolution downloads and more privacy controls. It's geared for independent developers and those who want to tap into their own creativity.
For a more general-purpose tool, DreamStudio offers a range of AI models for generating art, photos and illustrations. With tools like multi-image editing, inpainting, outpainting and instant style transfer, it's geared for people who want to be more productive and experiment with new ways of generating imagery. The site offers early access to the latest Stable Diffusion models and a large canvas for heavy-duty editing.