DALL-E (labs.openai.com) - review DALL-E is a project by OpenAI that generates images using the ChatGPT language to parse requests. The company started as a open source project. It is now an corporation owned largely by Microsoft.
Fotor (www.fotor.com) Fotor, by Chengdu Hengtu Technology Co. , offers a photo editor, ai photo generator and stock photography.
Mage Space (www.mage.space) Mage Space is an AI tool that uses stable diffusion to generate images.
Midjourney (www.midjourney.com) Midjourney is a subscription based AI image generation program that one access through their discord server.
Picsart (picsart.com) Picsart offers an online image editor which includes an AI image generator.
DreamStudio (dreamstudio.ai) DreamStudio offers a stable diffusion based image editor and image editor. An intro page says they sell 100 credits for about $1.18. It takes several credits to generate a picture.
Lexica (lexica.art) Site offers a library of AI generated content.
Astria - (www.astria.ai) Astria is a stable diffusion project that you can train.