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Online invoicing system with automatic billing status indicator. With the correct IDs, customers may search their own invoices and view the payment status.
Price: $49.95

EasyReceipt is a web-based receipt/invoice script designed with budget in mind. It allows multiple employees to use the same script at the same time without having to worry about sharing violations. With blazingly fast speeds and resources hardly touched, you have the minimized costs and increased efficiency. Prints directly from your PC.
Price: Free for Members/$30

Get more info from your orders, ban free email addresses and anonymous proxies. Keep track of your orders easily, even using Clickbank or Revecom.com. Stop fraud. Stop bogus orders (and keep your merchant account!). Be independent of any processor. Use any processor you like. Use any shopping cart you like. Saves money, and your credibility.
Price: $79.00

Use Instant Quote to provide customers with the their total cost. Provides a solution for multiple items with multiple variables and even sales tax.. Instant quote can add, subtract, and multiply. Complete with on-the-fly conformation page, dynamic cost calculator, unique reference numbers, and HTML formatted autoresponder.
Price: $64.00

InverseFlow Web Invoice Suite is a powerful, web based account management solution. Every company needs a simple, powerful way to generate invoices, and maintaining a record of all customer transactions and sales. InverseFlow knows this. Web Invoice Suite unique and powerful application designed to keep track of your customers and transactions easily and efficiently - and at the same time create invoices which can be folded and mailed right away.
Price: $113.96

Invoice Center will allow you to accept multiple payments from your website. Capabale of being run on a secure server, this program allows you to setup and fully configure a payment depot in minutes. All results are stored and on your server. Payment notifications can be sent to any number of people! From the administration section, just enter any number of email addresses in the "Submission Notifications" field. Separate each address with a space.
Price: Freeware

The EPI (E-Payment Interface) provides a consistent interface to the major payment gateways. An online shop might use more than one payment gateway depending on the payment mode and EPI makes this task easy and transparent. In addition to the simple interface, the development of new modules or features is very easy and straightforward.
Price: Freeware

This is a very complete time management system for people who bill clients both by quote and/or by the hour. This system allows you to add clients, add jobs to clients, keep track of a ton of info on all clients as well as calculating whats been charged, whats been deposited, whats still owed, etc. It has a built in daily reminder system that you can use for all needs. It has built in client stats areas, where the client can keep track of what you have done, as well as send you local and/or email messages. Email areas have built in autoreply functions so you never lose the plot in conversations.
Price: Free for Members/$400

This script is designed to cope with pincode billing systems. It adds a new dimention to your current pin systems. Currently an ibill module is available, however others could be coded per request. The user can create an account free for X days (definable) which then goes on to be billed onto an ibill pin account.
Price: Free for Members/$100