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Leopard Sample Code
Mac OS X includes a number of open source technologies. These include a number of command-line tools, various servers such as Apache, the X11 graphical environment, several widget toolkits like wxWidgets and Tcl/Tk, and a number of programming languages like Perl and PHP. Developers can leverage these technologies to improve their user experience, reduce development time, and develop and deploy powerful web-based, command-line, and graphical applications.
A guided introduction and learning path for developers new to open source.   Essential information about open source technologies.   API references organized by framework.
Open Source Topics
View the complete Open Source Sample Code List.
High Performance Computing
Resources for scientific and high-performance computing. 		 
Internet & Web
Web programming technologies in Mac OS X. 		 
Porting
Porting information related to open source software development for Mac OS X.
Tools
Open source developer tools, including GCC and GDB.