Gorm (Graphic Object Relationship Modeller) is a GNUstep application for building user interfaces and application objects relationships. Its major features include drag-and-drop creation of GUI elements from palettes, run-time loading of additional palettes, direct on-screen manipulation of GUI elements, manipulation and examination of objects via inspectors, and creation of connections between objects using mouse. It is a clone of the former NeXTstep (currently OS X) "Interface Builder" application.
F-Script is a lightweight scripting layer specifically designed for the Mac OS X object system (i.e. Cocoa). It provides scripting and interactive access to Cocoa frameworks and custom Objective-C objects. It aims to be a useful and fun tool for both beginners and experts, allowing interactively exploring, testing, and using Cocoa-based objects and frameworks.
XEMPIM is a complete rewrite of EMPIM (the Excessively Modular Personal Information Manager) for Mac OS X. It is written in Objective C/Cocoa to provide maximum compatibility with the OS X environment. The goal of (X)EMPIM is to create a core program which implements methods for loading, unloading, displaying, and communication between autonomous dynamically loadable modules. Each module provides a separate aspect of a standard PIM (Contact List, Calendar, etc).