Given the recommendation in the general discussions thread, when that thread was moved to the other ebook readers forum, I thought I would start a new thread on accessing the tablet from GNU/Linux systems.

A PHP based client has been written by Andreas Gohr which gives full access to the tablet's contents stored on the cloud, allowing listing, uploading and downloading: the ReMarkable API github site.

On Debian, I had to simply clone the repository, , then and finally . At this point, I could use the remarkable.php script to start interacting with the cloud storage for the reMarkable tablet.

Works very well for listing and downloading; uploading has some quirks which I am still investigating (tablet claims documents are corrupt).

Update: there was a bug with the upload aspect. Raised an issue and this was resolved very quickly! Works very well now.
Do I understand this correctly - this lets you interact with the cloud storage, not directly with the device, right? So to have an effect on the device, you need to activate the cloud uploading/downloading?
Yes, that is correct. For me, this is a good thing as it means I can send or get stuff to/from the tablet without being next to the tablet.
Late to the party, here. But thank you for finding this (and raising the issue with the api!) I find the cloud... challenging, in that I work primarily with ebooks, so having an access method that is more reliable than what I have found with the windows/android clients is awesome. Maybe I'll even connect the tablet to the cloud from time to time :-p
An update: as of today, it looks like this means of accessing the reMarkable tablet no longer works. It seems like the API for accessing the cloud storage has changed. This is very annoying as it's the easiest way to upload and download documents to/from the tablet from Linux.