Diigo Better reading and research with annotations, highlighter, sticky notes, archiving, bookmarking and more. Freemium Web Android iPhone iPad Internet Explorer ... Chrome Safari Firefox Browser sync IFTTT integration PDF annotation Real time collaboration ... Save web page for offline use Annotate screenshots Social Bookmarking Text Highlighting Add a feature 238 Like
Hypothes.is Annotate with anyone, anywhere Our mission is to bring a new layer to the web. Use Hypothes.is to discuss, collaborate, organize your research, or take personal notes. Free Open Source Web Chrome Firefox Google Chrome extension Text Highlighting Web-Based Add a feature 24 Like
gdriv.es Google+ and Facebook Comments read and write comments based on website using google+ or facebook Free Web No features added Add a feature 0 Like
