I use automatic1111 (stable diffusion), it requires you to have a decent graphics card with plenty of VRAM. https://github.com/AUTOMATIC1111/stable-diffusion-webui

There also exist online services such as Bing image creator, Midjourney, Craiyon, wombo, blue willow, adobe firefly, starryai, etc

A no-signup demo environment for stable diffusion is available here (but doesnt really compare to using a local install) https://huggingface.co/spaces/stabilityai/stable-diffusion