siwapp is an open source web application, built with PHP (Symfony), that enables anyone to create & manage invoices with ease.
The application has a slick interface & provides a simple usage to create professional-looking invoices.
invoices with different serial numbers can be managed
invoices can be downloaded as PDF files
periodical invoices can be created automatically
& more
siwapp uses MySQL to store data & if you need periodical invoices to be e-mailed automatically, a scheduling system (like cron) must be used.
It can also work as a module (be integrated to other business management applications) with the API support.
