Consultant is a simple yet powerful client and employee billing application. After adding all your clients and employees and their associated bill/pay rates, you can quickly generate bills based on hours spent at that client.
(commercial) eVideo manages your customers and videos. Designed for video stores of all sizes.
(commercial) integrates a Internet-based credit card processing terminal and transaction database in one application -- using an advanced SQL database engine, iAuthorize keeps a permanent log of your transactions for record keeping, reports, settlements, and refund
Organise Pro is a customer, order, inventory (stock control), and invoicing system.