People who use Google Apps - Education Edition also use:
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Drupal
in 159 toolboxes
add to my toolboxVery extensible CMS platform based on PHP and used by many NGOs - "Community Plumbing"
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Firefox
in 345 toolboxes
add to my toolboxFirefox is the popular open source web browser from Mozilla
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Skype
in 228 toolboxes
add to my toolboxFree/cheap Internet telephony and handy IM tool.
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OpenOffice
in 203 toolboxes
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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Basecamp
in 125 toolboxes
add to my toolboxWeb-based project management tool
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Salesforce
in 64 toolboxes
add to my toolboxWeb-based CRM that donates licenses to nonprofits
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MailChimp
in 18 toolboxes
add to my toolboxEmail marketing/newsletter tool that tracks open rates, click-throughs, etc, segmentation support, and an "infinite" number of lists.