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GNUstep - http://www.gnustep.org/
A GNU project to write a completely OpenStep compatible programming environment based on Objective-C, with intentions to also maintain Mac OS X compatibility. |
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Cocoa - http://developer.apple.com/cocoa/index.html
Apple's Objective-C based programming environment for Mac OS X. |
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The MiscKit Frameworks - http://www.misckit.com/
A free collection of Objective-C objects useful to Rhapsody, OPENSTEP, GNUstep, and NeXTSTEP programmers. |
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Portable Object Compiler - http://users.pandora.be/stes/compiler.html
A preprocessor that will convert Objective-C into regular C. |
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ActiveDeveloper - http://www.interactive-technology.com/
Interactive runtime Objective-C IDE for Windows, Mac OS X, OpenStep NIS. |