If you need to convert files from one markup format into another, pandoc is your swiss-army knife. Pandoc can convert documents in markdown, reStructuredText, textile, HTML, DocBook, or LaTeX to
wysihtml5 is an open source rich text editor based on HTML5 technology and the progressive-enhancement approach. It uses a sophisticated security concept and aims to generate fully valid HTML5 markup by preventing unmaintainable tag soups and inline styles.
Easy Markup
Use the red pen tool to highlight specific passages or portions of a document for your audience.
Powerful Analytics
Built-in analytics provide real-time insight into how viewers engage
with your documents.
Access Controls
Enable or disable downloading and printing of your documents, and restrict where they can be embedded.
Organize your documents and URL's.
manage your research work. create awesome presentations. share a bunch of links. all in a single Webklipper URL!
Takes notes on webpages and documents.
take notes on anything. share your notes with friends. markup any webpage with highlights and comments.
" GroupDocs.Viewer
HTML5 document viewer for your web, mobile & desktop apps.
Support for 50+ file formats, including PDF & Microsoft Office
On-premises & SaaS deployment options
User access control & SSL encryption
Works across all popular platforms
.NET Library Java Library Cloud API Cloud App
GroupDocs.Annotation
Add document annotation capability to your application or website.
Support for over 50 common document and image file formats
Several users can annotate the same document in real time
Support for native PDF & Microsoft Word annotations
14+ markup and commenting tools"