Parson’s problems are assignments for learning programming where the learner has to select, order, and indent code fragments. The goal is to construct a program which fulfils the task of the assignment. That’s best explained with an example task. The assignments have versatile feedback options: line-based, code execution and variable check or unittests, as well as neat turtle graphics.

There's also a mobile version in the works (for the past 3 years :)). The lib has been used at least at Aalto University, University of Turku, and in the Interactive Python books. Also, there's an online site.

Technologies: jQuery, jQueryUI, Skulpt, React.js, Django

Source code: https://github.com/vkaravir/js-parsons and https://github.com/vkaravir/js-parsons-editor

Collaborators: Originally implemented together with Professor Petri Ihantola; further development and research with Juha Helminen.