QOwnNotes is the open source (GPL) plain-text file notepad with markdown...
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QOwnNotes is the open source (GPL) plain-text file notepad with markdown support and todo list manager for GNU/Linux, Mac OS X and Windows by Patrizio Bekerle, that (optionally) works together with the notes application of ownCloud or Nextcloud.

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AppImages: QOwnNotes [Утилиты]