DjvuNet is a fully managed Djvu reader in C# and supports the entire Djvu file structure. This was created to support my commercial activities as Djvu is a superior format for certain document types. DjvuNet is a faithful implementation of the Djvu specs and should work fine for most situations. It is fully usable, but probably needs to be optimized a bit as Djvu is complicated.
Optimal performance will be achieved with some background thread processing.
Work on this project has been continued at https://github.com/DjvuNet/DjvuNet.
Usage
DjvuDocument doc = new DjvuDocument(@"Mcguffey's_Primer.djvu");
var page = doc.Pages[0];
page
.BuildPageImage()
.Save("TestImage1.png", ImageFormat.Png);
page.IsInverted = true;
page
.BuildPageImage()
.Save("TestImage2.png", ImageFormat.Png);