Civitai

Civitai is where the Stable Diffusion community shares fine-tuned models, LoRAs, and generated art, with millions of user-uploaded models covering everything from specific art styles to particular characters, all rated and reviewed by the community. It's the default destination for anyone customizing a local image generation setup, and it also runs a cloud generation service for people who'd rather not run models on their own hardware — though it's also drawn real controversy over NSFW and likeness-related content moderation.