A lexical analyzer generator that makes the class source code.
ULS is a class library for creating lexical analyzer from language specification file. It's provided as C/C++/C# and Java (class) libraries with a few of tools on Linux/Windows platform.
Dapar is a universal parsing library written in C. It will interpret any grammar you give it in a BNF-like format, and constructs a matching expression tree for any given input. This makes developing a new parser for any language simple and reliable.
Includes an ABNF parser, EBNF parser, XML parser and algebraic math parser.