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google-drive-remarkable-sync
Discontinued Apps Script library for synchronising Google Drive folder with Remarkable reader.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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remapy
An open source explorer for your remarkable tablet to show, upload or delete files via the remarkable cloud.
There's a Google Drive sync script that synchronizes a Google Drive folder with Remarkable cloud storage (It pushes everything in that folder to rM Cloud which then pushes it to your rM device).
There are at least 8 GUI clients written by the community listed on the reHackable github.
I created remapy for linux: https://github.com/peerdavid/remapy