Image generation

Stable Diffusion
https://stablediffusionweb.com/

Text-to-image application: Text input can be used to generate images in a short time. It is worth trying different text variants and comparing the results. Even multiple runs with the same input can produce different results. Stable Diffusion is available both as an app (e.g. for mobile devices) and as an online application. Images can be generated directly for free on the homepage under "Stable Diffusion Playground". Registration is not required for this.

Midjourney
https://www.midjourney.com/home/?callbackUrl=/app/
https://docs.midjourney.com/

Text-to-image application: Images can be generated using text input. There is a charge for the application (although some free runs are available). A Discord account is required to use the tool.

DALL-E
https://openai.com/dall-e-2

Text-to-image application from Open AI. The application can generate images based on text input, extend or add to existing images, or create variants of them. Registration is required to use the tool.

to be continued ...