There are some options:
-
WebKit.Net (free)
-
Awesomium
It is based on Chrome/WebKit and works like a charm.
There is a free license available but also a commercial one and if need be you can buy the source code 🙂 -
HTML Agility Pack (free) (An HTML Parser library, NOT a headless browser)
This helps with extracting information from HTML etc. and might be useful in your case (possibly in combination withHttpWebRequest
)