PrismSharp (nuget): PrismSharp is a syntax highlighting library based on an excellent javascript library PrismJS, fully written in C#. It currently supports over 270 programming languages and has 44 built-in visual themes, also supporting custom themes.  Out of the box, it supports HTML and RTF output, but any output format can be easily implemented with the AbstractHighlighter base class
Keywords: syntax|highlighting|highlighter|tokenizer