A lightweight .NET library for HTML5-based document annotation. Designed for easy integration into .NET (ASP.NET, C#, VB.NET) apps, it allows end users to annotate 50+ types of files, including PDF, Microsoft Word, Excel, CAD & raster images. The library comes with a customizable web UI, provides a comprehensive set of commenting on and markup tools, supports native PDF and Word annotations and doesn't require any client installation.