The RechnungsZentarle V2 is a multilingual, multiuser invoicing webapplication. You can handle from everywhere the invoices of your customers. Share customers with other admins. And if you want you can can use the export the bills as PDF and send them to your customers. You can collect invoice line items and create later on invoices based on them.

Agileco's billing application for the SME is a stand-alone, web-based billing application that completely automates account registration, ordering, subscription management, automated invoicing, recurring billing, account management, commerce reporting, and newsletters. AgileBill supports unlimited themes, languages, and currencies. Supports over 40 payment processors for full order and invoice automation. Agileco's Content Protection solution enables content and service providers with various tools to lock down their online content and/or services, effectively limiting access and routing user registration and authentication through the AgileBill billing application. A database mapping module enables integration with forum, CMS, and other popular applications. Also features optional affiliate, ticket management, web hosting provisioning, and domain name registration modules. Freeware

Have a live P.O.S. (point of sales) solution for your current OSCommerce shopping cart. Type in products and product discriptions manually as well as you may start to search for products out of your OSCommerc online shop by query.

AgileVoice empowers your company with all the features you need for running Voice over Internet Protocol businesses, including Broadband Residential and Business Phone, PC to Phone, Wholesale (termination/origination) , Traffic Exchange, IP Centrex, Calling Cards, and more. AgileVoice was designed with carrier grade customers in mind. As such, AgileVoice scales to many Asterisk systems, down to a single all-in-one system.

phpBMS is web-based, open source, Business Management Software (BMS). The phpBMS package is based on the LAMP stack. phpBMS is designed for small and midsize enterprises looking for an integrated system to manage their business. A system that is capable of managing daily operations, creating and printing orders, tracking clients and prospects, and fulfilling accounts receivable needs.

Features include: credit card encryption, PDF & HTML invoices & reports, unlimited line items, accept unlimited payment types / amounts (split payments), clients can login and download invoices (HTML format), get serial numbers, warranty information, and even pay invoices with a credit card. Free plug-ins for WorldPay and PayPal! Supports credit invoices for refund purposes, easy to edit HTML invoice generation. Create items using names, SKU’s and part numbers. Add serial numbers, and descriptions. Dynamic payment terms and invoice due date support! You assign tax values (percentages) to suit your countries tax. Reports total amount of invoices paid, pending, and partial payments, shows you tax collected values for easy government remittance. Complete security logging (stores IP address, name, date, time, etc.). Export clients to vCard. Assign projects and service calls to staff and download iCal or Outlook calendar files! Includes mass e-mail functions! XHTML v1.0 valid!

E-Pay is an open source invoicing application that allows you to create, edit, and organize your invoices and clients. Your clients can login to view and pay their invoices. Payments can be entered and the total will adjust accordingly. The invoice status can be updated to reflect payments made. There is a printer-friendly link so clients can print a copy of their invoice. There is also support for quotes. E-Pay is built with standards compliant HTML and features a very user-friendly interface.

FREE Simple to use Online invoice system ! It has PayPal support option. 1.) Secure Admin section plus Client login section. 2.) Add as many clients as needed. 3.) Add as many invoices for each customer as needed. 4.) Invoices self total the inputted data. 5.) You can search through customers or invoices for keywords. 6.) Keeps track of Payments you receive from customers. 7.) Automatic Email Paid Invoice system you can turn on or off. 8.) You or client can create a clean invoice for printing. 9.) 10 separate Items per Invoice plus misc, shipping etc... 10.) Support forum for questions about script.

A free php/mysql program for invoicing clients, they can view and/or print their invoices. The system allows an administrator to enter the client details and create invoices. Each client must be given a username and password to log in to view their invoices, and the administrator can view the full database by client, date, amount etc. There is an optional email notification system, and full instructions included to install this cool invoicing script.

PHPWPos is a web based point-of-sale system written in php. It uses a MYSQL database backend to store data. PHPWPos has an administrator area and a sales frontend. PHPWPos is Free Software released under the GNU/GPL License.

Simple Invoices is a clean, simple, and basic Web-based invoicing system. It is meant for personal invoices, home office invoicing, small organization invoicing, and basic POS (point of sale) systems for light usage. Its goals are to be easy to use, simple and clean, and focused on its task. It is not meant for heavy-use POS applications, nor is it meant to be enterprise ready.

MiniBill is a great companion to your business as much as your business requres recurring billing. Right now it supports Authorize.net as the recurring billing gateway but is easily extendable to use others. It is written to be pluggable, small and affordable. It is extendable through PHP using smarty templates and a very simple database schema.

netInvoicing::Customer Manager, Invoicing & Billing is a straightforward, powerful and intuitive billing and invoicing system. It keeps track of clients, time, suppliers and materials. It generates invoices for the items you want and automatically emails the invoices to clients. Send detailed business invoices in minutes with the new, netInvoicing system. Designed for the small professional that wants to use the power of the Internet to invoice clients. It features full administrative controls, email invoicing, client login area and many more. netInvoicing ARB enables you to create "subscriptions" for recurring billings. Simply enter the customer's payment information, billing amount, and a specific billing interval and duration. netInvoicing ARB automatically generates the subsequent recurring transactions for you.