NOTE: I specifically asked a moderator if I could post this, but if there is a problem from the other guys in charge here, let me know.
I recently saw a post on a Mac related forum I go on from a developer asking for a few beta testers for BookBuddy Pro. I knew that they could get better feedback from people who are actually well invested in reading and not just some random strangers who'll try anything, which is why I wanted to pass it on to everyone here on MR.
BookBuddy is a book manager (a very good one might I add!). Does a few interesting things like lets you track your entire collection, categorize them, indicate which ones you've loaned out, tag them, and make a list of your favorites. It also lets you keep a wish list, books you've borrowed from the library, and search through it all. It has a nice engine to find books, and also allows you to select your own covers and enter custom data.
It is a little cumbersome, and I've mentioned this to them already. I'm sure there may be some other things, but I am just one voice and I think they'd appreciate more.
They're already on the App Store, the app has been around for awhile actually. so you might be familiar with it:
https://itunes.apple.com/us/artist/k...d./id395149953
And here's the TestFlight signup if you're interested:
http://www.testflightapp.com/join/2f...0cba-MzQ5NDcy/
If you've never used TestFlight, the feedback is done through e-mail. When you get a new update e-mail, you can just reply back with any comments.