I do use Typora as a Markdown editor and it is actually my default one for DEVONthink 3 documents. However I can’t see any way or in any degree how it could in any way organize a structure similar to DEVONthink 3 overall, cross platform or not. I just can’t see it at all. I am not a ‘links’ whizz I admit.
Typora has none of the features that DEVONthink 3 has and that I use all the time? A knowledge system based on links to outside documents from within Markdown files I would have thought would become hopelessly unwieldy at any reasonable scale?
I recently found I still needed a dedicated bibliography for some things in fact, the ‘link’ and notes system I was using was too cumbersome and overloaded. Sometimes you just need to see citations in a list.
Bookends works well for me with DEVONthink 3 and I keep double copies of the PDFs if I store any in Bookends so they are searchable from DEVONthink 3.