Mastering Bitcoin - The Bible for Bitcoin
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!
bitcoin.team - Track the most active Bitcoin Core developers 🛠️
Kittysplit - The easiest way of sharing costs with a group of friends
Cluttr - Personal assistant for housemates 🏠🙌
ihatemoney - Manage your shared expenses, easily