XGP is an integrated development environment that extends GNU Prolog to work with Cocoa under Macintosh OS X. It provides user interface and graphics facilities largely compatible with MacProlog32 by LPA. Requires Mac OS X version 10.2.1 or greater.
Pattern Builder is an object modelling and code generation tool for Mac OS X developers. It can model and generate the class files for complete Objective-C/Cocoa applications, with Interface Builder outlets and actions, which can then be built in Xcode.