HtmlAgilityPack – Open source, fast, and full-featured. It has a large community and is easy to get started with.
AngleSharp – Also open source and fast. It has a simple, fluent API and can parse HTML5.
CsQuery – A robust tool that offers ease of use and performance.
HtmlParserSharp – This is a lightweight parser known for its speed and efficiency.
System.Xml Namespace: A versatile library with plenty of functionalities.
Лично пробовал HtmlParserSharp, для такой задачи в полне подойдет
