phpBMS is a PHP, MySQL based billing, scheduling, and client management system. Features include PDF generation for printing, mass e-mailing to clients, repeatable task and event handling, and quote/order/invoice tracking.
The package has undergone many bug fixes and several enchancements including the ability to attach external files to product, client or invoice records. The package can be installed over the top of existing installations (using the update script) and upgraded without losing data.
You can find the latest release at:
https://sourceforge.net/projects/phpbms/