WHMCS - WHMCS is an all-in-one client management, billing & support system for online businesses.
Digit - SMS bot that monitors your bank account & saves you money
HostBill - HostBill is a powerful and flexible, all-in-one automation, billing, client management and support platform for online businesses.
Olivia - Your new best friend built with an artificial neural network
Blesta - Blesta is professional client management, billing, and support software.
Spendee - See where your money goes