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CitrusDB is a web based customer care and billing software solution (CC&B) that uses PHP and a database backend (MySQL) to keep track of customer information, operational CRM, services, products, billing invoices and credit cards, and support inf...

siwapp is an open source web application meant to help manage and create invoices in a simple, straightforward way

The aim of the Open Source Software Directory is to list the best and most promising open source software available on the Internet.

Find and compare the best billing and invoicing software. Compare invoicing solutions using features, user reviews, pricing, system requirements, and more.

Reviews of some of the best online invoicing and billing software providers available on the web. All reviews are written by other entrepreneurs.

Social Media news blog covering cool new websites and social networks: Facebook, Google, Twitter, MySpace and YouTube. The latest web technology news, via RSS daily.

Open-source billing, CRM, trouble ticketing and automation software for ISPs, VoIP providers and online businesses.

Free, Online, Open Source invoicing and project management application targeted at freelance designers/programmers and small to medium sized businesses that need to easily keep track of their time and invoicing.

Free computer tech support and tons of computer tips and tricks.