Please write a single answer per comment to clearly see the most popular tools. Vote on the ones you like.
There were too many options in this post and I want to see what are the really interesting ones.
To complement this post:
What file-sharing and media organizing software do you wish that existed?
1. Posts must be related to the discussion of digital piracy
2. Don’t request invites, trade, sell, or self-promote
3. Don’t request or link to specific pirated titles, including DMs
4. Don’t submit low-quality posts, be entitled, or harass others
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Calibre for organizing, converting, and syncing eBooks.
Absolutely vital for anyone who uses an ebooks.
I personally dislike it. It has a poor appearance and instead of copies books instead of tracking them wherever I want them to be. However, it is currently the best option available.