I am sure everyone here is familiar with calibre, the free and open-source ebook library management tool. It is a great way to manage your ebook library, and it was a great tool even back when it was called libPRS500.
But I am not sure quite so many people are as familiar with Calibre Companion. This is a paid app for Android and iOS that you can use to wirelessly download ebooks from your calibre library to your mobile device.
CC's former developers announced the change a couple weeks ago:
Dear CC community,
As many of you have noticed, neither Steve nor I have been actively developing CC for quite some time. The reasons are diverse but can be summarized as "Life Happens". That said, neither of us want to leave CC unloved. For that reason we decided to pass the CC project to another developer, Sam Cohen (@samcohen). The transfer has started and will complete over the next few days.
Sam is very excited about taking over the projects and reviving active CC development on both iOS and Android.
Steve and I thank all of you for your encouragement and support over the last 7 years (has it really been that long?). We very much appreciate all the comments, complements, and criticisms you took the time to give us. We hope that you will be as supportive of Sam as you have been of us.
I will remain involved with calibre and will continue to hang out in this CC forum, commenting when I think I add value.
-- Charles & Steve
I own a copy of Calibre Companion (I bought it in 2014, actually) but I can't say that I ever really used it. Now strikes me as a good time to try it and post a review.