The original project is ancient (2011/2013) and dated. It is now coming back with a facelift, collaborative editing and offline support, powered by vlcn.io
Readme from 2013:
Strut
A GUI / Authoring Tool for ImpressJS and Bespoke.js
Don't know what ImpressJS is? Check out the ImpressJS demo presentation: http://bartaz.github.com/impress.js/#/bored
Start using Strut! http://tantaman.github.io/Strut/dist/
(works in Firefox, Chrome and Safari with basic support for IE10)