Are there any free AI comic strip makers that allow me to edit the generated panels after creation?

Direct editing within the AI tool is rare in free versions. Many tools output images that you'll need to edit using external image editing software (GIMP, Photopea, etc.). Some, like Microsoft Designer, allow basic text editing within the tool, but extensive panel manipulation usually requires separate software. Look for tools that output in a layered format (like PNG) for easier editing.