In Search of the NeXTSTEP Look

GUNTHER asks: "I've fallen in love with the NeXTSTEP style interface. I would love to have a NeXT machine but they are rather hard to come by these days, so I have been looking for programs and libraries to emulate its look and feel. I am familiar with GNUStep, Afterstep, TKStep, and GTKStep but what else is available to emulate the NeXTSTEP look and feel?"