AffiliateWP - A powerful affiliate marketing solution for WordPress.
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!
ReferralMagic - Turn your users and customers into referral magnets.
Splittable - Shared living made simple
Echo - Golang HTTP server framework
EquiTable - Split the bill fairly