Help looking for inventory software

Hello, I am sorry if this is appropriate but does anyone know php based, open source solution that would enable me to put a system handling inventory (books, booklets). I work for a charity and we are archiving our old products by making a digital archive. So far we have been doing it in Excel but I would really like to move it to a relational database (like mysql). Have been googling around for solution but without much luck. Anyway, it does not have to be an inventory project. Even a modular system that would allow me to design and generate php files, would be really, really helpful. Sorry if this is wrong group to be asking such a question. Thank you in advance for any pointers! Zbigniew Szalbot