From MacMasters Computer Services:
Create as many Contacts as you need while tracking every Invoice for each Customer. Print professional looking invoices and quickly view the outstanding balance of an individual or all your customers. Download the free trial demo today. You can use the demo for free but purchasing the master password gives you 100% complete access to the entire database including layouts and defining fields. You must have FileMaker Pro version 7 or 8 to use the Contact Invoice Database.