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rmapi
Discontinued Go app that allows you to access your reMarkable tablet files through the Cloud API
I dont know about official support but https://github.com/juruen/rmapi works fine for me (I only upload and download files on the PC though...)
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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I'm working on a full functioning remarkable desktop app for all platforms but mainly linux. It works completely locally without cloud. Its far from done yet but you can follow it here https://github.com/Lyr-7D1h/remarkable_client
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rmirro
A script that synchronizes PDFs of documents between a Remarkable and a computer folder that mirrors its file structure without cloud access
I've spent some time making a cloudless sync solution (for Linux), in case anyone is interested: https://github.com/hersle/rmirro