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Alexa provides information about websites including Top Sites, Internet Traffic Stats and Metrics, Related Links, Online Reviews Contact Information and Search Analytics for SEM and SEO optimization. The Alexa Toolbar is a browser add-on that shows d...

Easily find more sites like those you like. Similar Sites helps you find related sites and alternatives based on community recommendations and computer analysis.

Offers bookmark synchronization, search enhancement and web discovery based on sites bookmarked by users.

PLoS ONE: an inclusive, peer-reviewed, open-access resource from the PUBLIC LIBRARY OF SCIENCE. Reports of well-performed scientific studies from all disciplines freely available to the whole world.

FREE SEO & PPC Keyword Research software tool, that unveil your competitors’ most profitable Ad copies & keywords. Learn from time-tested Ad campaigns.

National Geographic Education brings geography, social studies and science to life. Using real-world examples and National Geographic's rich media, educators, families, and students learn about the world and the people in it.

Free books and documents search with fast and relevant results better than any online library.

MarineBio is a nonprofit organization staffed by volunteer marine biologists, students, professors, and conservation advocates working to share the wonders of the ocean realm inspiring marine science education, research, and a sea ethic.

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