ANN: Linguist: a bottom-up backtracking parser in C#: free software

Open source. It supplies the C# programmer with many of the facilities of
the popular Unix utilities Lex and Yacc. However, it has a quite different
interface, will handle a superset of Yacc's grammars, and will return all
valid parses of its input when the grammar is ambiguous. It includes a
lexical analyzer and an interactive test facility.

Documentation is at http://www.frontiernet.net/~fredm/pa...inguistWebPage

It is reasonably well tested, but bug reports and suggestions would be
welcome.