Unblocked-gaming platform letting students play games on filtered school networks. Built by Purdue student Maddox Schmidlkofer starting at age 16 on Google Sites; grew to ~1.5M monthly users and roughly $15k-$20k/mo revenue before selling to gaming company FreezeNova for $120,000.
Newsletter discovery and analysis tool
Mobile UI screenshot gallery and inspiration tool
Searchable library of UX patterns and user flow recordings from real apps.