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GoTodo: The Ultimate Task Management for Teams and Individuals.
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Apple Notes functions as a service for making short text notes.
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Workflow automation and content collaboration software.
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Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.
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Encrypt and send files and notes with a link that automatically destruct after being read. SafeNote is a free web-based service that allows you to share a note or a file with confidentiality. There is no way to spying on you even to a hacker.
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TickTickis a cross-platform to-do list app & task manager helps you to get all things done and make life well organized.
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The secure, collaborative notebook.
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Laverna is a JavaScript note taking application with Markdown editor and encryption support.
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Windows alt-tab on macOS.
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A note-taking tool for visual learning.