Another good option is Stablecog, an open-source multilingual AI image generator that uses Stable Diffusion and Kandinsky models. You can generate art by describing an image or starting with an existing image. It has several pricing plans, including a free tier with 20 images per day, so it's good for artists and designers.
DeepMake is another option. This open-source generative AI tool runs on your own machine, so you have complete control over the creative process. It can generate text-to-image, mask faces and objects, and upscale images and videos, so it's a good option for creative pros. It also works with other VFX and video editing tools like Adobe After Effects.
If you want something more basic but easy to use, ImgGen offers a free online AI image generator that doesn't require signups or watermarks. It can generate high-resolution images up to 4096 x 4096 and offers a range of photo editing options like AI headshots generation and photo upscaling, so it's good for quick high-quality image generation.