App created in September 2016 using Webix library free (standard) version. See it's license file in codebase folder
App design has two languages: English and Russian. You can switch between by comment/uncomment assets/questions.js, assets/design.js in index.html and and changing title section
All popups are draggable
App doesn't need server: all questions are in assets/questions.js (questions_en.js) file (see instructions in it)
You may customize design elements in assets/design.js (design_en.js)