NeXTDPS - NeXT display postscript server.
NeXTDimension - next dimension rom/kernel code.
NeXTMach - NeXT Mach kernel (not sure which version exactly)
NeXTSrc - Various NeXT source pieces including Appkit, GNU sources, NetInfo libNeXT, and others.
NeXTDSP - NeXT DSP code. Midi libraries, soundkit, and others.
NeXTEmacs - NeXT version of GNU emacs.
NeXTROM. - NeXT Firmware rom code.