Former Web Annotation Systems
- This list is incomplete; you can help by expanding it.
- The earliest web annotation system was probably CritLink, developed in 1997-98 by Ka-Ping Yee of the University of California. CritLink worked as an HTML "mediator", hence not requiring additional software or browser extensions but having limited support for modern JavaScript-driven websites.
- Annotea - a W3C project that tried to establish a standard for web annotation.
- ThirdVoice - a system launched in 1999 that shut down due to lack of success in April 2001.
- Fleck* - launched in 2005 with much publicity as a stick-it notes application for the web. A patent, funding and marketing didn't stop it from failing. Discontinued in 2010.
- Google Sidewiki was part of Google Toolbar, and allowed users to write comments alongside any web page. It was discontinued in December 2011.
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