With this system you can record the amount of customer balances
PHP framework for data management apps with minimal code
Timeline Silverstripe Module
An accounting / educational / MRP / ERP / CRM system for SMEs
JomSocial plugin for a customizable recommendation system
OpenSource Inventory Management
phpbb Multiple domain Single Sign on with wordpress plugin
Property listing, real estate site based on druapl 5.x
Qlnmp
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A tool that will let you generate shipping labels in pdf
Keep track of all your job costs, make sure you don't lose money