They all offer an online converter so you can try it. Each of them seems to convert exactly what I see in a Web page. That was not the case for many others. Some, in fact, will always provide a different output when executing the same command on the same page.
Those ones offers .NET integration. Two of them seem to offer the same library. The 3rd one is different.
If you have feedback on one of those or any suggestions, feel free to send them in.
