NeXTStep was famous for rapid application development. The framework combined with Interface Builder, a GUI builder, is just magic. I read a quote a while ago,

NeXTStep was famous for rapid application development. The framework combined with Interface Builder, a GUI builder, is just magic. I read a quote a while ago, Berners-Lee saying that without NeXTStep he couldn't have built the project. Unfortunately I can't find any reference anymore. Edit: Seems somebody else found it, see other comments.