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Skype
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OpenOffice
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add to my toolboxFull-featured open source office productivity suite, featuring word processor, spreadsheet, presentation, drawing and database packages; free MS Office replacement.
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Wikipedia
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add to my toolboxWikipedia is a global and multilingual Web-based cooperative free-content encyclopedia.
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LinkedIn
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add to my toolboxSocial networking for non-social purposes with a focus on professional development, networking for jobs and problem solving through the expertise of those in your extended network.