Step 1: Understand the Request
The user is asking for information on free AI drawing tools.

Step 2: Identify Available Options
There are several AI drawing tools available online that offer free services、Some popular ones include Deep Dream Generator, Prisma, and Artbreeder.

Step 3: List Specific Tools
1、Deep Dream Generator: Uses a neural network to generate surreal and dreamlike images from any image you upload.
2、Prisma: Turns your photos into works of art in the style of famous artists like Van Gogh or Picasso.
3、Artbreeder: Allows users to create and evolve original artwork through a process that involves genetic algorithms and user input.
4、DALLE Mini: A simplified version of DALLE, which generates images from text prompts.
5、Craiyon (formerly DALLE Mini): Generates images based on text descriptions.

Step 4: Consider Limitations and Usage
While these tools are free to use, some may have limitations on usage, such as watermarks on generated images or limited resolution、It's also worth noting that the quality and style of the generated art can vary greatly depending on the tool and the input provided.

Step 5: Provide Information on Accessing These Tools
These tools can typically be accessed through their respective websites、Some may also have mobile apps available.

The final answer is:
Some popular free AI drawing tools include:
1、Deep Dream Generator
2、Prisma
3、Artbreeder
4、DALLE Mini (now known as Craiyon)
These can be accessed through their respective websites.