Mendeley does more than organizing and sharing references and documents. In fact, it does a whole lot more.

Mendeley is a desktop and web application for Linux, Mac and Windows which extracts bibliographic information directly from the desired PDF documents and then builds a database that can then be exported to any format we desire, and shared with the colleagues we wish (quite useful for research groups) or the larger Mendeley community.

Zotero is a Firefox extension designed for storing, organizing, citing and sharing research sources.

Zotero not only allows storage of scholarly papers, but also websites, images, links... A feature especially useful in current research, more and more reliable on non-academic sources.

CiteULike is an online service for storing and organizing references and pdf documents found in the Internet.

Moreover, it allows for documents to be shared with coleagues and friends, for people with similar interests to be found (for instance, who else is reading that one article that I've found so interesting, and what other stuff that person is reading); all of it with an intuitive, user-friendly interface, accessible from anywhere in the world through an Internet connection.

Connotea is one of the most extended systems for reference organization and sharing.

Great ease of use, simple and elegant interface, powerful tools, possibility of applying it to any Internet-based content: these and other virtues make Connotea a very useful tool for making the most of our academic work.

Scribd is, in short, the YouTube of written documents.

We may upload any document we wish (Word, PDF, PowerPoint): Scribd turns it into a web file (iPaper) viewable online, from any place, at any time; and of course, shareable with anyone we desire.

Although it is not specifically designed for scholarly papers, but to all kinds of written documents, its flexibility and unspecificity allow for countless uses and offer great advantages to scientific research.

Bibsonomy is a system for sharing and organizing bookmarks and lists of literature. It stores the publications we wish in its server so that we may access them from anywhere, enables tagging so we can locate them with ease, it suggests similar entries, and facilitates communication between users and groups with common interests.

Papers is a commercial application for Mac OS X, especially designed for researchers, which enables to organize in a personal library all our documents and research papers in an intuitive and simple fashion.

Endless searches through our folders and desktop for a particular article or author are over: Papers offers powerful search tools, tagging and collections so that finding a paper will take just a few seconds.