The Deprogram is really good.

A way to jump to the next comment within a level. Infinity had a big button to jump to the next top level comment, and the reddit web page you can click on the colored bar that aligns the comment levels to jump to the next comment.

Calibre-web is my favorite library management software, but it doesn’t completely replace Calibre for me. Calibre-web is only related to Calibre in that it uses the same library format and uses Calibre’s ebook conversion tool.

Calibre is nice to have with Calibre-web if only to repair a corrupted library. Calibre also has a lot of tools to fix problems within ebook files, plus a good plugin ecosystem.