There are several AI tools available that can generate images for free、Here are a few popular ones:

1、DALLE by OpenAI: This is a powerful AI model that can generate images from text prompts、It's not completely free, but you can get some free credits to try it out.

2、MidJourney: This is another AI tool that can generate images from text prompts、It's free to use with some limitations.

3、Stable Diffusion: This is an opensource AI model that can generate images from text prompts、There are several online platforms that offer free access to this model.

4、NightCafe Creator: This is a webbased AI art generator that offers a limited number of free generations per day.

5、Artbreeder: This platform uses AI to generate images based on text prompts、You can sign up for a free account and get a limited number of free generations per day.

Please note that while these tools are free to use, they may have certain limitations or restrictions、Additionally, the quality and style of the generated images may vary depending on the specific tool and your input prompts.