Hi, I used a summer of unemployment to actually finalize a hobby project, a literal clone of Apple's Notes, with open access to the filesystem, meaning each note is just a markdown file. Then implemented renderers for Excalidraw, Latex, AsciiMath, mermaid diagrams, PlantUML, Graphviz, Vega Lite, mhchem and footnotes (a feature i need a lot in texts).
It can also show notes in vertical lists, like swimlanes, I call it "JIRA view" ;)
Free for now (might monetize later if anybody is actually interested in the tool, with $19 one-time payment, NOT subscription)!
macOS app, but Windows and Linuxes are planned too.
I'm not 100% sure about the legal aspect of this, but i will try to even list it in the Appstore. The binaries are signed / notarized by Apple.
*PLEASE NOTE:* This is an early alpha! SO BACKUP YOUR STUFF OR JUST WORK WITH COPIES! There are issues! I'm posting this here to collect hurtful user feedback. There's a bug report button in the app, and it will notify you about available updates.
Thanks, I kindly request any form of feedback!