GoodBooks.io - Largest curated collection of 8,500+ book recommendations.

Xmind - Xmind is a brainstorming and mind mapping application.

Goodreads - See what your friends are reading.

MindManager - With MindManager, flexible mind maps promote freeform thinking and quick organization of ideas, so creativity and productivity can live in harmony.

boook.link - boook.link is a web-based tool for creating one single link / landing page for a book, so your readers can choose from which store to buy the book.

MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.