fleshgolem
I have recently landed on Tauon which has a pretty particular UI that is pretty unlike most others, but after some getting used to worked well for me. Audacious is mostly fine as well, but at some point I did not want to use it anymore because it would just stop responding to MPRIS events too often
For remote playing I have been really enamoured with Navidrome (in combination with Symfonium) lately. It's not super pretty, but it really has the best organization of albums I have seen so far and I kinda just dont use it for local files, because I dont want to do everything in the browser...
Selling books is actually quite the complicated matter in some countries. At least in Germany you are not allowed to sell a book at a price of your choice (http://en.wikipedia.org/wiki/Fixed_book_price_agreement)
It can be pretty fucking annoying to have these laws in place (they do have their merits, but... that's a completely different debate), but I can understand Amazon not having worked out all the legal issues to go worldwide with this
Still a great read though