Hubstar is a web application created by Team-tut for Qiita Hackathon #3 in 2013. It allows users to "star" and "share" specific parts of source code, such as functions or lines, hosted on GitHub. The client-side uses KnockoutJS, RequireJS, Coffeescript, SCSS, Bootstrap and Font Awesome, while the server runs on nginx, gunicorn, supervisor, a Flask RESTful API, MongoDB, and is hosted on a Sakura VPS.