phpMoneyBooks is a PHP/MySQL program that aims to be a Web-based QuickBooks replacement. It can manage bank accounts and check registries; manage customers and create statement charges; print statements to bill customers; and display profit and loss reports. The design is modular so that features can be added by any PHP/MySQL developer. With new modules, you can direct the user to a URL. Clients can log in and check their own bills and pay online, create memorized billing cycles with Auto Billing (good for recurring billing), and more.
The Open-Transactions project is a collaborative effort to develop a robust, commercial-grade, fully-featured, free-software toolkit implementing a full-strength financial cryptography library, API, CLI, and prototype server. Open-Transactions democratizes financial and monetary actions. You can use it for issuing currencies/stock, paying dividends, creating asset accounts, sending/receiving digital cash, writing/depositing cheques, cashier's cheques, creating basket currencies, trading on markets, scripting custom agreements, recurring payments, escrow, etc. Strong crypto is used. Balances are unchangeable (even by a malicious server). Receipts are destructible and redundant. The transactions are unforgeable. The cash is untraceable. The cheques are non-repudiable.
NixBill Automation provides many features to manage your Web hosting business. It provides hosting modules, domain modules, payment modules, and encryption modules. Its encryption modules use a unique solution for credit card data storage, which can use AES methods or others, such as PGP. You can create as many encryption modules as you like to store different sets of credit card data differently.
The Amberdms Billing System is a Web application that provides accounting, invoicing, service billing, and time keeping functions. It is designed for small and medium businesses. This program is developer-friendly with a SOAP API, as well as being appropriate for ISPs with service usage billing features.
SAFE stands for Service and Administration Front End. It is a basic Web-based application that allows small companies to perform invoicing tasks, both one-off invoices and recurring services (subscriptions). Subscriptions can be entered with a price per month, per quarter, or per year. Invoice lines can be joined together by your company administrator into an invoice. That invoice can then be downloaded in PDF format, printed, and sent to the customer. SAFE is meant to allow non-techical people to work with the invoicing system, so simplicity is key.
geoPlugin is a PHP class that can get geographical information from an IP address using the geoPlugin Web service, also known as geolocation or geoIP. It takes a given IP address and sends a request to the geoPlugin Web services server to obtain the geographic location associated to the IP address. The class also retrieves the location's currency name and conversion rate relative to a given base currency. This can be used to convert a given amount of money to the local currency. It can also retrieve locations near a place given its latitude and longitude coordinates.