MindSpark is an open-source mind-mapping app with no accounts, no paywalls, and no lock-in. Every map is a real Markdown file ā edit the canvas or the text and they sync live, both ways.
š§ Infinite canvas, keyboard-first editing, live auto-layout
š Markdown ā mind map, live preview, download as PDF
š§® A built-in formula engine ā SUM(children), AVERAGE, IF
Try it, fork it, or just read the code ā it's zero dependencies, so there's not much to hide.
