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

1、DALLE Mini: This is an opensource version of OpenAI's DALLE, which can generate images from text prompts.

2、MidJourney: This is another AI tool that can generate images based on text prompts、It's free to use, although there are paid plans with more features.

3、NightCafe Creator: This platform uses AI to generate art and images、You can upload your own photos or create new ones from scratch.

4、DeepArt: This tool allows you to transform your photos into works of art using the style of famous artists.

5、Runway ML: This platform offers a variety of AI models for generating images, videos, and audio.

Please note that while these tools are free to use, some may have limitations on the number of generations or the resolution of the images you can create without a paid plan.