Booknshelf - Social book and bookshelf discovery platform.

Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.

Inkshares - Tinder for book ideas

Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.

Tablo Publishing - The Best Way to Publish a Book.

Qiqqa - Qiqqa is a free research and reference management software. It can be used in many organizational projects from the academic to the personal to the business endeavor. Read more about Qiqqa.