Bill Watch
If you are looking for a highly customizable and powerful bill management application then here is the Bill Watch that features the bill reminder and tracker in a single application.
4 Alternatives To Bill Watch
BillMinder
BillMinder is for tracking the record of the bill due date and making it sure that you will never again get late in paying your bills at due date.
Bills
Bills is an ultimate companion for the purpose of bill tracking and a reminder that will help you in paying your bills on time and make it sure that you will never miss the payment of bill again on the due date.
Tracker
Projects/Tracker - GNOME Wiki!
jBilling
jBilling is a world’s leading web-based open-sources billion solution that gives you all the flexibility that you need for highly complex billing.