SwarmUI
FreeA simplified front end over ComfyUI — the engine underneath is still ComfyUI
An MIT-licensed AI image front end with 4,459 stars. It is not an engine itself: ComfyUI runs underneath while SwarmUI provides a form-style interface on top — for people who want ComfyUI's capability without facing the node graph. Note the repository moved and now lives under mcmonkeyprojects/SwarmUI; many older links are stale.
Why we picked it
SwarmUI's pitch is "ComfyUI's capability with a form-based interface". 4,459 stars, MIT — the fewest stars here but the most permissive licence.
ComfyUI runs underneath, so model compatibility follows ComfyUI, while the layer on top turns common parameters into a form with no node wiring. You can drop back to the node view when you need fine control.
One practical trap: the repository moved and now lives at mcmonkeyprojects/SwarmUI. Plenty of tutorials still point at the old location, which is no longer updated.