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This is at least as hard as CLI, but Emacs’
org-mode
is a very capable to-do list. There are plenty of emacs plugins that add reminders and notifications, though getting these to work on mobile may be a pain.There are plenty of FLOSS alternatives: https://alternativeto.net/software/microsoft-to-do/?license=opensource
final thoughts: sleek is an awesome foss to do app based on todo.txt https://github.com/ransome1/sleek