Last updated at 5:12 am UTC on 15 February 2019
Tweak is a rewrite of the Morphic UI and events framework. It's used in Croquet, or you can download standalone images containing the latest version. See http://tweak.impara.de (not found, TODO add web link to web archive)for more.
AR: The base idea behind Tweak is simple: Combine the best of Morphic with the best of MVC.
Tweak Core Architecture Release (3.6-based)
informative interview with Andreas Raab
Raab 2001 Events Scripts and Multiple Processes Original Tweak Memo
The first alpha release announcement