ANTLR version 3 supports target language generation for the lexical analyzer and parsers. Objective C was supported previously but had not been brought up to date for some time. This release is built on the work by Kay Roepke, Ian Michell and Alan Condit. The project is currently working sufficiently for me to use it in compiling my grammar and tree walker. I am sure that it still has some bugs but I have fixed all of the bugs that I have found so far. The project consists of an Objective-C runtime framework that must be installed in /Library/Frameworks. It also requires the installation of the String Template files to support the target language code generation. Hopefully, at some point they will be incorporated into the ANTLR release code, so that the individual user doesn't have to do anything but load the framework into the proper location. However, for now you need to create an ObjC directory in antlr-3.2/tool/src/main/resources/org/antlr/codegen/templates and then copy the ObjC ".stg" files to antlr-3.2/tool/src/main/resources/org/antlr/codegen/templates/ObjC/*. There is also a java file ObjCTarget.java that goes in < antlr-3.2/tool/src/main/java/org/antlr/codegen/ObjCTarget/Java>. If you are using Antlr3.3 the code from here is included with the Antlr tarball. You just need to copy the ANTLR.framework to /Library/Frameworks. antlr3.4.1 Feb. 22, 2012 -- I just uploaded a new binary(zipped) copy of the ANTLR.framework and antlr3.4.jar that has all of the renaming changes that I did to match the Java source names and fixes to the DFA transitions. This is antlr-3.4.1.jar. pegli fork 2012-11-20 -- the purpose of this fork is to get ANTLR running on iOS.