Wikipedia

Features

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• Giving feedback
• Research help and similar questions
• Community discussion
• Contacting individual Wikipedia editors

Screen Shots

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Related Links

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• Contents
• Current events

Competitors

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• LittleWiki
• JotSpot
• PBWiki

• wikidot
  Wikidot is a farm of Wiki Sites. Their mission is to provide free and professional wiki publishing, collaboration and communication solutions to anyone who needs it and wants it.
• PrivatePhone
  a free local phone number with voicemail and messages you can check online or from any phone.
• Moo Telecom
  VoIP communications made easy - Ring anyway with the fun and ease of using a normal phone
• flashphone
  Flashphone is a free-of-charge web-service which allows you to call from the internet page. All that is necessary for calls - headset and sufficient bandwidth of your internet connection. Never before the IP-telephony was such simple and accessible.
• TagR
  Mobile Social Network with Real Time Locations Based services, and Ambience Intelligence, VoiP, IM, Skype, Googletalk, Mapping, Flickr, Events, Calendaring, Scheduling, SecondLife Support
• MooV
  Using cutting edge Video phones and Software Video Phones - coupling all that with VoIP and empowering the disabled.