mGSTEP is an implementation of the core elements in
NeXT's (now Apple)
OPENSTEP/Cocoa(tm) Objective-C class libraries. The principal design goal
is the development of a modular application development framework suitable
for use in embedded devices and server appliances running Linux, FreeBSD
or OpenBSD. The GUI (AppKit) portion of the current release is X11 based.
The top center and left screenshots below were created with mGSTEP and
WindowMaker running on Linux. The
Windows NT screenshot employed the native Win32 GUI backend which is no
longer under active development. The two bottom screenshots show the
tableview example built using the same Makefile and source code running on
mGSTEP/Linux and Cocoa/MacOSX.