Annotary is described as 'The easiest way to remember what you read and research online and share it with colleagues. Using our bookmarking and annotation tools, you can create an easily accessible repository of all your research for yourself and your organization' and is a social bookmarking tool in the web browsers category. There are more than 25 alternatives to Annotary for a variety of platforms, including Web-based, Android, iPhone, iPad and Mac apps. The best Annotary alternative is CherryTree, which is both free and Open Source. Other great apps like Annotary are Instapaper, Diigo, Tagpacker and Milanote.