For converting codebases into mindmaps, you've got a few options. Pyreverse, part of Pylint, can generate class diagrams from Python code and even export them as Mermaid diagrams. Aider.chat uses tree-sitters to create text-based "repo maps." Additionally, Excalidraw is an open-source tool that supports WYSIWYG editing of diagrams and integrates well with Mermaid.