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A.nnotate is an online annotation, collaboration and indexing system for documents and images, supporting PDF and MS Office formats. Instead of emailing different versions of a document back and forth you can now all comment on a single read-only copy online. Unlike online word processors, the document is displayed in high quality with fonts and layout just like the printed version. It is easy to use and runs in all common web browsers, with no software or plugins to install.

"Simple tools that let you study anything, for free"

"SwellRT is an backend-as-a-service providing real-time and collaborative services to new or existing applications."