People who use Wordpress MU also use:
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WordPress
in 198 toolboxes
add to my toolboxFlexible open-source content management and blogging software with an active user and developer community and a wide variety of plug-ins or extensions available.
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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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Flickr
in 160 toolboxes
add to my toolboxWeb based photo sharing service
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Audacity
in 96 toolboxes
add to my toolboxFree, open source software for recording and editing sounds.
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GIMP
in 116 toolboxes
add to my toolboxA freely distributed piece of software for such tasks as photo retouching, image composition and image authoring.
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YouTube
in 75 toolboxes
add to my toolboxUpload up to 100MB videos and embed them in your sites. Now with dedicated channels for nonprofits.
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Last.FM
in 28 toolboxes
add to my toolboxSocial Networking meets Internet Radio
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LinkedIn
in 144 toolboxes
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.
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Gmail
in 159 toolboxes
add to my toolboxGmail is a web-based email with very user-friendly interface and huge storage capacity
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Facebook
in 114 toolboxes
add to my toolboxFacebook is a social utility that connects you with the people around you.
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Social Source Commons
in 144 toolboxes
add to my toolboxThe Social Source Commons is a “knowledge commons” that provides users with: a directory of software applications; links to relevant documentation, localization tools, services, user reviews; and a place to request tools/features.
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Twitter
in 125 toolboxes
add to my toolboxTwitter is a global community of friends and strangers answering one simple question: What are you doing? Answer on your phone, IM, or on the web.