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

PHP Invoice is most powerful online web based billing / invoicing system yet easy to use

Buy PHP, ASP.NET, Java and Javascript from CodeCanyon - the marketplace for code scripts and snippets.

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.

The Online Invoice system is a basic invoicing system for you to invoice customers for services or products using email.

SourceForge.net. Fast, secure and free downloads from the largest Open Source applications and software directory

Billing and client management software

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

ScriptCopy.com is a resource for PHP clone scripts of popular websites. If you are want to open a new Youtube or Craigslist you came to the right place.

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OStatic

Find extensions for your Joomla site in the Joomla Extensions Directory, the official directory for Joomla components, modules and plugins.