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Uxcel - The easiest way to learn UX/UI design
Splitwise - Splitwise is a free tool for friends and roommates to track bills and other shared expenses, so that everyone gets paid back. On the web, iPhone, and Android!
UX Challenges - Done reading about UX? Start doing it.
Splittable - Shared living made simple
UI Coach - Become a better UI designer in 30 days