[donio]

Calibre is not bad if you stick to the CLI utilities and avoid the GUI. ebook-convert in particular is pretty much all I need from Calibre. I normally run it with the following options:

  ebook-convert input.someformat output.mobi --remove-paragraph-spacing --change-justification=justify --enable-heuristics --unsmarten-punctuation

(It's picky about the ordering of the input/output vs the flags)

[dewey]

I usually download some additional metadata and then send it to my Kindle via the "Mail to Kindle" Mail address, I could probably script that part easily but for the few times I use it right now I'll just have to stick to the GUI.

[benologist]

There's a project called COPS which adds a small web site to your Calibre library so you open it in the Kindle browser - it's pretty convenient:

https://github.com/seblucas/cops

http://www.linux-magazine.com/var/linux_magazin/storage/imag...