WebUIs
Auto1111 WebUI – most popular installation
Vladmantic – alternate fork of auto1111 with more updates, may not be compatible with some extensions
InvokeAI – the most aesthetic UI, with no extension support
Extensions
ControlNet WebUI Extension
ControlNet Models
Models/Checkpoints
RealisticVision – photorealism
Ayonimix – stylized general purpose
Texture Diffusion – flat, diffuse textures
360 Diffusion LORA – for 360 panoramas