Simple Invoices is one of those programs that does one thing, and it does it very well - . Invoicing. It is a community sponsored project that is getting great reviews.
If you run a small business you know how tedious invoicing customers can be. Simple Invoices makes its a simple as possible. Anyone who can work with a word processor can use Simple Invoice.
If you are comfortable with basic LAMP environment, Simple Invoice should be pretty easy to install. Teh community is very active and there is plenty of documentation to assist. There is also a hosted option if you prefer and they have a list of preferred providers on the website.
The feature list is extensive and comes with everything you would expect and invoicing program to do. Emailing, PDF conversion, reporting, reconciling, payment reporting etc..
One important feature is the extensions. Extensions provides a basic method to develop and distribute integrated customisations for Simple Invoices. Think of them like Firefox extensions. Simple, single function add-ons that solve a specific issue or add a specific feature.
In addition, there are templates and styles to change the look and feel and modifications. Modifications are like extensions that are not integrated into the main program.
Simple Invoices is a powerful program and is targeted towards small business and non-profits. The developer community active and always looking for developers and ideas. \
I am going to keep my eye on this one