To better utilize this app a powerful WYSIWYG editor is needed. CKEditor provides a feature-rich WYSIWYG editor which you can check on the following link. It is open-source and fully configurable.
I would like community members to weigh in their thoughts on this.
Website Links - `https://ckeditor.com/
Note: It supports out-of-the-box export to markdown format along with others.
It's not open-source and may not even be free for Joplin.
EDIT
Or maybe it is open source after all.
Ok, it is but licensed under GPL.
They do have a caveat for that:
If you are running an Open Source project with an OSS license incompatible with GPL please contact us and we will be happy to support your project with a CKEditor 5 license.
But that seems messy to me when TinyMCE or even something like Prosemirror are MIT which makes life a lot easier.
Hi there! Wiktor Walc from CKSource here (President & CPO). You will be qualified to the "Free for Open Source" program without any problems - you do not have to worry about it. It would be great if you decided to use CKEditor 5.
As for the markdown itself - we use markdown support in GitHub - ckeditor/github-writer: GitHub Writer - WYSIWYG Rich-Text Editor for GitHub, powered by CKEditor. for example.
Regarding licenses - it's a broad topic. We decided to go into the GPL direction being tired of big enterprises using the software and not giving anything back to the project/community, sometimes even just demanding fixes or free support instead. We still love Open Source though, that's why we want to cover it by providing free licenses to GPL-incompatible projects.