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Leopard Release Notes
A full suite of free developer tools is available to Mac OS X developers, who can speed up their development process by using these tools to prototype, compile, debug, and optimize their software products. Xcode, Apple's integrated development environment, can be used with Cocoa, Carbon, or Java. Apple also provides a wide selection of open source tools, such as GCC.
A guided introduction for developers new to Mac OS X developer tools.   Essential information for developers using the Xcode software development tool set.  
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Compiler Tools Release Notes (HTML)
Describes the latest changes to the Mach-O assemblers, linkers, and object file tools.
 Compiling & Debugging 2007-04-11
Dynamic Loader Release Notes (HTML)
Updated for Mac OS X v10.5.
 Compiling & Debugging 2009-03-04
GCC 3 Release Notes (HTML)
Updated for Xcode 2.3
 Compiling & Debugging 2006-05-23
GCC 4 Release Notes (HTML)
Updated for Xcode 3.0
 Compiling & Debugging 2007-10-31
GDB Release Notes (HTML)
Updated for Mac OS X v10.5
 Compiling & Debugging 2007-05-16
LLVM-GCC Release Notes (HTML)
Lists changes to LLVM-GCC technology.
 Compiling & Debugging 2008-09-09
Symbol Variants Release Notes (HTML)
Describes symbol variants, a way of providing multiple versions of symbols for backwards compatibility.
 Compiling & Debugging 2007-10-16
Dynamic Loader Release Notes (HTML)
Updated for Mac OS X v10.5.
 Darwin 2009-03-04
Symbol Variants Release Notes (HTML)
Describes symbol variants, a way of providing multiple versions of symbols for backwards compatibility.
 Darwin 2007-10-16
Dashcode 2.0 Release Notes (HTML)
Explains key features, known issues, and workarounds for Dashcode 2.0.
 Dashcode 2008-09-09
Interface Builder 3.0 Release Notes (HTML)
Interface Builder 2008-03-05
Interface Builder 3.1 Release Notes (HTML)
Updated for Interface Builder 3.1
 Interface Builder 2008-05-30
Malloc Debug Environment Variables Release Notes (HTML)
Performance 2005-04-29
AppleScript Studio 1.4 Release Notes (HTML)
Moving Tiger AppleScript Studio Release Notes to separate document.
 Scripting & Automation 2007-12-22
AppleScript Studio Release Notes (HTML)
Describes late-breaking news and highlights of new or changed features in the latest release of AppleScript Studio.
 Scripting & Automation 2007-10-31
Automator Release Notes (HTML)
Updated for changes in Mac OS X version 10.5.
 Scripting & Automation 2007-10-31
WebObjects 5.4 Release Notes (HTML) (PDF)
Information about known issues and workarounds for WebObjects Release 5.4.
 WebObjects 2007-12-11
GDB Release Notes (HTML)
Updated for Mac OS X v10.5
 Xcode 2007-05-16
Interface Builder 3.1.1 Release Notes (HTML)
Describes configuration changes, bug fixes, and newly reported issues since Interface Builder 3.1.
 Xcode 2008-09-09
ld Release Notes for Xcode 3.1 (HTML)
Xcode 2008-05-29
LLVM-GCC Release Notes (HTML)
Lists changes to LLVM-GCC technology.
 Xcode 2008-09-09
Terminal 2 Release Notes (HTML)
Describes new features of the Terminal application in Mac OS X 10.5.
 Xcode 2007-10-31
Xcode Release Notes (HTML)
Lists changes to Xcode.
 Xcode 2008-11-19