Tools for mind mapping your dev knowledge - suggestions?

Hey all, I'm researching out a whole bunch of tools for mind-mapping CS knowledge, which also help to integrate more detailed documents. I normally use miro for mindmaps (https://miro.com/app/dashboard/), but quite limited on the free version. Ideally, I would like something which I can add, for example, longer text without looking weird, or a code-block or a link to another document. Do you know if such tool exist? Or would you have any suggestions in general for documenting your programming knowledge? I would be happy about your suggestions. 😺

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