I am in the market research field 20yrs+. I try to promote ODK since several years to client but failed. Client using Decipher/Survey Monkey. It feels like Python wq Framework, Kobo Toolkit and Ona.io is pretty good. They are lack of functionality that Decipher has. I want to get development environment of wq or KOBO or ONA to extend it's functionality. They are lot many ELEMENT but want to add BLOCK element it take questions and randomized, also can put a limit i.e. show only 3 question out of 5. There are more complex element can be built like feature quota to split sample in 2 different proportions. List is long...Card sort...