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!
Stripe - Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for online businesses of all sizes. Use Stripe’s payment platform to accept and process payments online for easy-to-use commerce solutions.
Kittysplit - The easiest way of sharing costs with a group of friends
Solo - Personal kanban boards hosted on your own server
ihatemoney - Manage your shared expenses, easily
Cash App - The easy way to send, spend, bank, and invest.