Just a quick starter, I don't have much time, so...
10 the magic number
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Today the OpenStep API celebrates it's 10th anniversary. What started
out as a joint adventure of NeXT and SUN to define an application
development standard that would run on all machines, making a write
once compile everywhere paradigma a reality, is still a vivid and
active community of GNUstep, old NeXT and Apple lovers.
The magic 10 appears in Apple's OS X and in GNUsteps current 1.10.x
release numbers. Currently people are able to develop their programs
on Mac OS, Linux, the BSDs, Solaris, and with a couple of hurdles even
on Windows. Slowly but steadily a solid and well defined standard is
reaching out to the world of software development.
Program your applications in a couple of hours instead of days, weeks
or never. Use the advanced API of a development framework that didn't
need any modification for 10 years, because it rocks, is stable and
just works.
You want to know more? Visit the links below:
GNUstep:
http://www.gnustep.org/
http://www.roard.com/gnustep/GNUstep-brochure.pdf
http://www.roard.com/gnustep/Booklet.pdf
http://www.roard.com/docs/lmf1.article/
OpenStep:
http://www.toodarkpark.org/computers/objc/
Apple:
http://developer.apple.com/documentation/Cocoa/