After a 8 years hiatus, GNUStep is back. From http://www.aiei.ch/gnustep/ What is it? GNUstep (this is a live CD, an operating system, a distribution) contains a lot of software for GNUstep, a free implementation of the OPENSTEP and Cocoa framework (which was also the base as Cocoa on Mac OS X). It includes an excellent application called Gorm for RAD (Apple Software Design Guidelines). More about the Objective-C Language. The currently used window manager is Window Maker. Read this very informative articleabout what GNUstep is. If you are an OPENSTEP, Cocoa developer and want to port your software to GNUstep and release it as Free Software, contact me. More what is questions answered. Still not impressed, read this? Read great documentation. Hopefully soon with a microkernel and a more usable approach to OS design. History about the Lighthouse Design Ltd.. [snip] Features of GNUSTEP live CD 2.5 Debian 9.0 based, Linux 4.9 No systemd but classic init Emacs, GCC, Clang, bash, zsh Nginx, Knot, dropbear, xrdp Gorm.app, Chess.app, FontManager.app Protracker, Mr. Boom, Grafx2
Its the open source code on which the proprietary Apple COCOA framework is based. That's free and the rest forms the basis of the MAC OSX GUI... which is UNIX.