FlowPaper Classic - collaborate and annotate pdf documents on the web
FlowPaper Classic lets your users collaborate within your PDF documents using just a browser! Add notes, highlight text and draw figures in your documents and share the annotations among your colleagues. The product supports printing, exporting annotations back to PDF or saving them in a database so that your users can share and take their notes with them. Web annotations in FlowPaper features a full set of API methods which can be used to add annotations support to your application.
The viewer comes with easy to set up scripts in ASP.NET, PHP and JSP. This online document viewer supports touch devices as well as traditional desktop browsers in interacting with the annotations.