2010
Annotator | Open Knowledge Foundation
Open-Source Annotation Toolkit for Inline, Online Web Annotation
Simple javascript (+backend) library for web-annotation. Main goals were and are:
Annotation of arbitrary text ranges
Annotate any web (html) document
Easy to use — 2 lines of javascript to insert this in your web page/app etc
Well-factored and library-structured — easy to integrate and easy to extend
2008
Protonotes: Leave your mark | protonotes.com
2007
Marginalia Web Annotation | geof.net

