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.
FlatTraffic is a Web interface for analysing netflow records and showing statistics designed to make it clear and easy to determine which hosts on a network are consuming data. It has been primarily designed for use by networking and servers geeks who have to endure the pain of data-capped Internet Service Providers, something that's unfortunately rather common in the Australia/New Zealand region in particular.
SMStoXMPP is a lightweight PHP-based SMS to XMPP bi-directional gateway application which receives messages from an SMS gateway device/application and relays them to the target user via XMPP. Replies to the user can be made via XMPP, which then delivers the message back to the SMS gateway.