I just go to onlyfakes.app and mess around. Outputs are probably much slower than the other suggestions. There are a few different engines to choose from.

https://youtu.be/6MeJKnbv1ts

https://aqualxx.github.io/stable-ui/

Allows you to create without your own hardware. It uses distributed computing.

If you do have the hardware you can join the AI Horde. Which gives you priority when there is a que.

https://aihorde.net/

https://civitai.com/ has a bunch of models, I played around with it a little.

Piratediffusion. It has a thousand pre-installed models in a UI accessed from telegram or from their website. It costs around 20€ a month, but it's worth the price imo, for infinite generations.