AVS C# parser
Thanks to Alex Sedow for a link to AVS Software, which produces a pair of C# parsers for compilers and source-to-source translators. From the site:
The compilation parser is designed for applications that require converting source code into the internal format as fast as possible. Only the significant data required for correct analysis of the program is preserved. This parser is useful for the development of compilers, interpreters, analyzers and other tools that do not require modification of source code.
The transformation parser preserves all information in the program’s source code (including comments, spaces and preprocessing directives). This parser is useful for the development of refactoring and formatting utilities and other programs that do transformations on the program’s source code.