This is nice! My thesis writing experience always was far from comfortable, used Obsidian, Evernote, and Latex tools, but nothing matched my needs fully. MonsterWriter would definitely help me few years back.

But I have noticed that my problem is mainly in visualizing and remembering all the docs, pdfs, websites, and basically keeping all the bits of informational from various sources.

So I started my own hobby project LimanDoc[1] where it would serve the purpose of visualizing, diagramming, and previewing docs (later I'll add features like in Roam/Loqseq to backlink pieces of information). One important feature is keeping the files agnostic and possibility to open files in other 3rd party tools. If I want to edit word/excel/markdown files I do it in other tools, and in LimanDoc just preview it.

Still far from perfect, but it is available for download and play around.

[1] limandoc.com