I own a reMarkable 2 and wanted more to read on it than my own PDFs, so I built a free web app. You connect your tablet once with the official one-time code, then:

- Send any of 79,000+ public-domain books (Standard Ebooks first, plus Project Gutenberg, Wikisource and OpenStax textbooks).

- Get comics (xkcd volumes with the hover text, Pepper&Carrot, pre-1931 strips) and 33,000+ magazine issues from 1930 and earlier, re-rendered for e-ink.

- Get puzzle books (sudoku with unique solutions, mazes, nonograms) to solve with the pen.

- Subscribe to 160+ blogs and news sites; it builds one EPUB edition every morning or every six hours, and moves editions you've finished to the trash.

Each kind lands in its own folder, so notebooks are never touched. Built with Node and the reMarkable cloud API. No ads, no tracking, free. Feedback very welcome.