There are several free AI tools available that can help you generate cartoons. Here are some popular options:

1. Toonator: This online tool allows users to create simple animations and cartoons. You can draw directly on the site, and it also lets you animate your drawings frame by frame.

2. Animaker: This user-friendly platform offers a variety of animated character templates and scenes to help users create cartoon animations easily. While it has a free tier, more advanced features may require a subscription.

3. Canva: Known for its graphic design capabilities, Canva also allows users to create animated graphics and cartoons using its templates and elements. The free version provides a substantial library for cartoon creation.

4. Doodle Maker: This tool specializes in creating doodle-style animations, which can range from simple cartoons to more complex animations depending on your preferences.

5. Pixilart: While primarily a pixel art tool, it allows you to create and animate simple cartoon characters. Users can draw in a pixel format and then animate their creations.

6. DeepAI Cartoon Generator: This tool uses AI to turn images into cartoon-style pictures. You can upload your artwork or photos, and it will generate a cartoon version of them.

These tools can be great for experimenting with cartoon creation and are especially useful for hobbyists, educators, or anyone looking to create fun animated content for free.