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Zotero is a powerful, easy-to-use research tool that helps you gather, organize, and analyze sources and then share the results of your research.

YouTube is a place to discover, watch, upload and share videos.

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Vimeo is a respectful community of creative people who are passionate about sharing the videos they make. We provide the best tools and highest quality video in the universe.

Squidoo. The popular (free) site for creating single webpages on your interests and recommendations. Even earn money for charity or yourself.

Scribd is a social publishing site, where tens of millions of people share original writings and documents. Scribd

LinkedIn strengthens and extends your existing network of trusted contacts. LinkedIn is a networking tool that helps you discover inside connections to recommended job candidates, industry experts and business partners.

Aircraft For Sale at Controller.com. Your source for aircraft sales, used aircraft, Cessna airplanes for sale, aircraft dealers.

Learn Microsoft Excel and Charting online. Dicuss your excel and spreadsheet problems in forums. Get in touch and obtain a quotation for excel consulting. Learn excel and charting using tutorials, downloadable example and more - by Chandoo.org

Tu sitio About.com en español para aprender y resolver todas las cuestiones sobre hojas de cálculo de manera fácil y concisa