Invoiceit! Lite is apparently an economic application to manage, control and administer the invoices generated by your business/company, but it also offers many more features.
With Invoiceit! Lite you can store and administer the information on your credit cards, personalize the invoices to your taste, automate invoicing, generate quotes, take control of stock, make inventories, follow each seller and client, etc.
Some of the other options you get in Invoiceit! Lite are: generating reports, managing daily appointments, creating tags for mailing, applying tax rates (only in the USA and Canada), etc.