You might find the following useful : Visual Understanding Environment - https://vue.tufts.edu/ Came across this in another thread recently - https://quarto.org/. - Source: Hacker News / 6 months ago

I use this for drawing "graphs" in the formal math sense like you're looking for: https://vue.tufts.edu/. Source: about 2 years ago

There are a number of free and commercial softwares developed for diagrams, flowcharts, and mind mapping with similar features. I haven't used them in a while, but in the past I've liked yEd and VUE. Both are free and support multiple platforms. Source: over 2 years ago

The site is working for me ( https://vue.tufts.edu ) as is the download, so it was probably a temporary glitch. Source: almost 3 years ago

I think your best bet may be Visual Understanding Environment (VUE). I can't say for sure if it will store or play videos but they make a big deal about "digital media" on their website. Source: almost 3 years ago

Alternatively, you can use an online markdown editor like StackEdit or HackMD. - Source: dev.to / 5 months ago

Use https://stackedit.io/ in the browser :). Source: 7 months ago

Markdown is awesome! But, when writing 1000 words+ articles, I quickly feel the need for a better experience. For years, I’ve used StackEdit — an open-source, in-browser Markdown editor — for editing all kinds of long-format Markdown text. That said, given my recent experience with WYSIWYG editors, I thought I could do something better. - Source: dev.to / 11 months ago

This is especially annoying as when I export from stackedit.io to HTML, then it just cuts off anything which is outside the greyed in code window! Source: 11 months ago

StackEdit[0] pretty much perfected what I needed out of a markdown editor - I just need somewhere to write my tickets/docs that wasn't Github so that I could format it properly while writing. I still use it from time to time [0]: https://stackedit.io/. - Source: Hacker News / 12 months ago