Simple Business Invoicing & Inventory (SBII) is a complete sales management program that includes: invoicing, inventory management, automated billing, mailing list management, and sales tracking. Invoices and bills can be printed on plain paper or emailed directly to customers.
SBII Features:

An intuitive graphical interface with pop-up menus and pick lists that minimize typing. For example, to create an invoice you simply choose the customer and products sold from a series of menus. SBII fills in the invoice and computes the sales tax for you. Once completed, the invoice can be printed with a mailing label or emailed directly to the customer.

Inventory Management. Once you record purchases of the products that you sell, SBII tracks inventories by deducting items sold from inventory on hand. Inventory may be managed using either the First in-First out or Last in-First out methods.

Customer tracking. Customer profile reports show each customer, the items they have purchased and the dates each item was purchased.

Sales tracking. Product sales reports give a complete picture of the products that are selling and those that are not. The Buyers report shows you the names of customers who have purchased a particular product.

Mailing list management. Customers can be separated into up to 100 groups. Mailing lists and address labels can be generated for any combination of one or more groups of customers. This feature lets you target your mass mailings to just those customers who are most likely to respond to a given mailing. New to version 2, simple newsletters and announcements can be emailed to selected groups of customers.

Version 2.1 adds the ability to import customers and products from delimited text files and the ability to print packing lists.

SBII can be configured to automatically compute two sales taxes (e.g., Canadian GST and PST).

Income data entered into SBII can be imported into OWL’s Simple Business Accounting (SBA) to provide complete tracking of both sales income and business expenses.