MindMapExt is an online mind map editor that stays useful after you've drawn it. Add Task, Time, or Number modes so branches become checklists, effort estimates, and budgets — parent nodes sum automatically. Auto-save, Google sign-in, no install. Share privately, by link, or in a public gallery. Export to PNG, SVG, or Excel. Free to start; Pro ($3.99/mo) unlocks unlimited maps and Excel export.