kBilling is an invoicing software that will help you to manage your companies papers - customers, invoices, contacts, subscriptions and products. It is a tool for professionals who’s time is money. Now you don’t have to make several Excel forms and then search for the needed one. It’s all in one place and neatly packed. It features professional invoice generation in PDF, image and HTML format, customer account tracking, customizable reports and more.
kBilling is very easy to use but still if you get stucked almost every field contains "hover help" (hover your mouse pointer over a specific field and you will get a short pop-up about that field and what it does or requires). Free technical support included. It’s totally free for 30-days use.
Ps: Version 1.3.74 includes bug fixes and minor feature additions in reports.