Hi Walter,
I haven’t used Agenda much in combination with the apps you mention myself, best for others to chime in. I did want to mention some pointers that you might find helpful:
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While it’s not a markdown based system, Agenda does support markdown for entering and formatting text, lists, etc. see here
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Likewise as part of the premium features you can export and copy notes as markdown as well.
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Here’s a topic that talks about 3rd party integration, and this one is about syncing between Agenda and other apps, for example by making use of sharing extensions
Hope that helps!