If level of customizability is your main metric: Emacs can go from this: https://emacshints.files.wordpress.com/2013/09/spash1.png https://emacshints.files.wor

If level of customizability is your main metric: Emacs can go from this: https://emacshints.files.wordpress.com/2013/09/spash1.png https://emacshints.files.wordpress.com/2013/09/spash1.png to this: https://github.com/rougier/nano-emacs https://github.com/rougier/nano-emacs