Morphic: The Self User Interface Framework

Also in Pharo[1] and Squeak[2], but shoehorning it into a class based system turned out to have drawbacks. Juan Vuletich is doing some nice stuff with his Cuis[3] version.

The linked description is a little out of date but all the basics are still correct. It's quite a flexible system.

[1]: http://pharo.org/ [2]: http://squeak.org/ [3]: http://www.jvuletich.org/Cuis/Index.html

I have some short screencasts showing using the Self user interface here if interested: http://bluishcoder.co.nz/tags/self/

Also a short animated gif of a Self VNC morph I worked on: http://bluishcoder.co.nz/self/self_vnc2.gif

I like the 'live soup of objects' feel of Self.