smooth is an object oriented class library for Win32 and Linux written in C++. It's meant to become an alternative to toolkits like Qt.
A fast, unobtrusive and modern cross-platform GUI toolkit. Agar fully exploits hardware acceleration where available, but also supports simple frame-buffer interfaces. Agar is stand-alone and easily portable to new platforms and graphics systems.
The Mac OS X Port of analog which has been specially rewritten into ObjC code to take advantage of Cocoa. The rewrite will also incorporate new features not found in the console version. Includes a graphical interface, support for XML property lists. .
The Coconut Library is an Objective-C class library for PC-UNIX systems and MacOS X. This library is designed to develop software which works unix systems and MacOS X. And depends on Cocoa library for MacOS or Cacao library for unix systems.
Data Type Definition System
DTDS is a system of definition of data types for unification of information exchange with use of different Samond Classes Library functions and for generation of source texts based on the completed data type definition
Attempt of a portable cross-language object-oriented benchmark . So far supporting C++, Objective-C, and Java. Support for Smalltalk, CLOS, CSharp, and Eiffel is in development.
scl is Objective C library for macOS, iOS and GNUstep with custom set of ObjC classes and extentions of standard CF, Cocoa and Cocoa Toch classes, such as NSString
The aim of the StepMaker is to develop set of applications based on WINGs (WindowMaker window manager) and GNUstep. Step is part from "GNUstep" name and Maker is from "WindowMaker" name.
The Kiwi Programming Language is an object oriented script language. The target of this language/system is HyperTalk/HyperCard for UNIX.