This is a port of the latest GNU Emacs source to the OpenStep (or NeXTstep) APIs, as implemented by Cocoa on OS X as well as the GNUstep open source project.

It runs on OS X 10.4 ("Tiger") and above (and possibly Panther), as well as GNUstep on Linux, FreeBSD, and NetBSD (use 9.0rc2 release). It probably needs more work to run on Solaris and Windows. On OS X, 10.1 and 10.2 are not supported due to the absence of certain APIs supporting explicit character layout in text rendering. (Use Emacs on Aqua for those platforms as well as 10.3.)