Is there an ANTLR grammar/parser for language X?

The list changes constantly as people build more and more parsers and translators with ANTLR; some of these people make their work available. Your best bet is to ask antlr-interest@egroups.com, the active discussion of ANTLR. You can also ask in newsgroup comp.compilers.tools.pccts.

The www.antlr.org website and/or the ANTLR distribution have a bunch of full grammars such as Java, C, HTML, and IDL. The distribution includes a bunch of small examples.