Facebook is a social utility that connects people with friends and others who work, study and live around them. People use Facebook to keep up with fr...

ChemSpider is a free chemical structure database providing fast access to over 26 million structures, properties and associated information.

Good old Wikipedia, great new look

The leading provider of domain metadata information.

Free online thesaurus by Babylon. Find synonyms and hyponyms to phrase your ideas better

LibraryThing catalogs your books online, easily, quickly and for free.

Multilingual pronunciation dictionaries. Pronunciation guide to learn how to pronounce correctly with multilingual talking dictionary.

Twitter is without a doubt the best way to share and discover what is happening right now.

AbeBooks is your source for Used, New, Rare and Out of print books. Find classic collectibles, rare signed editions, used textbooks, and inexpensive ...