[DerWOK]

Zettlr[1] (FOSS) has mermaid support[2] included. Zettlr is a markdown editor for personal knowledge management and/or distraction free (scientific) writing w/ PDF publishing.

[1] https://github.com/Zettlr/Zettlr

[2] https://docs.zettlr.com/en/reference/markdown-basics/#zettlr...