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Poll Everywhere replaces expensive proprietary audience response hardware with standard web technology.
Animoto - The End of Slideshows
Animoto automatically produces beautifully orchestrated, completely unique video pieces from your photos, video clips and music. Fast, free and shockingly easy.
Welcome to Wikispaces - Wikis for Everyone
Create simple web pages that groups, friends, and families can edit together. Signing up and creating your own wiki space is fast, free, and easy.