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Bison is the GNU implementation/extension of Yacc, Flex is the successor of Lex.
Yes, this stuff is still used.
Flex (fast lexical analyzer generator) is a free and open-source software alternative to lex. It is a computer program that generates lexical analyzers (also known as "scanners" or "lexers").
Bison originated as a workalike of a program called Yacc — Yet Another Compiler Compiler. 9. Yacc was written at Bell Labs as part of the very early development of Unix; one of its first uses was to develop the original Portable C Compiler, pcc. The same person, Steven C. Johnson, wrote Yacc and the original pcc.
It's not entirely what you want but there is a very excelent Bison mode for Emacs.
http://www.emacswiki.org/emacs/BisonMode
This is a better link:
http://ftp.lip6.fr/pub/emacs/elisp-archive/incoming/bison-mode.el.gz
Since Yacc and bison are so closely related I don't find it lacking too much. Though I do most of my work with Antlr anymore.
Looks like Matz (of Ruby fame) wrote a yacc(/bison) mode. Have a look at http://www.rubyist.net/~matz/a/yacc.el
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