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Front provides a compiler front end generator that can generate a parser, pretty printer, symbol table handling, and Abstract Syntax Tree data structures and traversals. It also provides a C preprocessor library, and an AST rewriter generator.
The LALR parser generator (LPG) is a tool for developing scanners and parsers written in Java, C++ or C. Input is specified by BNF rules. LPG supports backtracking (to resolve ambiguity), automatic AST generation and grammar inheritance.
XOgastan is an API that allow to write programs that takes in input the file containing the ast generated by gcc and to analyze them. Using it you can collect informations about the generic C program represented by the AST (Tree) dumped by gcc.