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Google Keep online notebook
Google Keep (https://keep.google.com/u/0/) is one of the most popular free online notebooks that combines simplicity and advanced settings.
First, it's possible to create notes with checklists, attachments, images, and audio files rather than just plain notes.
Secondly, in addition to the usual task sharing function, here you can set reminders (synchronized with the calendar) not only by time, but also by location. For example, as soon as you arrive at work, a reminder knocks on your door.
In addition to the online service, there are also applications for Android and iOS, an extension for Google Chrome.
📝 Source: @computer_life