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!
WooCommerce - A freely available eCommerce plugin that enables shop facilities on your WordPress website. Functionality enabling extensions & beautiful themes available.
Splittable - Shared living made simple
Thirty Bees - Open e-commerce platform designed to work out of the box.
EquiTable - Split the bill fairly
Squarify.io - Sync inventory between Square and Shopify.