AtomineerUtils Pro Documentation - automatic DocXml/Doxygen/JavaDoc/Qt doc-comment generation/updating (similar to GhostDoc, but more powerful & flexible, and supports C#, C++, C++/CLI, C, Java and Visual Basic code).
The style of the generated comments is very configurable, and automatic re-formatting (such as whitespace control and word wrapping) can be optionally applied to keep the comments as readable as possible. It also has many helpers to allow users to read and convert most legacy doc-comments into any of the above formats.
(I'm the author, but I believe the above is an accurate and objective description. This add-in was free when this answer was first added, but to cover the costs of hosting, supporting, and continuing to improve the addin in monthly releases, it is now $10 with a 30-day free trial)
