I'd first check with your web host. Many web hosts offer an assortment of applications that are installable from the web based control panel that they provide. If they don't have something you need and you feel comfortable with installing some ready made application that might require some technical knowledge in getting installed then you can look around places like hotscripts.com where they have a large assortment of both free and commercial ready made scripts and many offer support in installation and such.
http://www.hotscripts.com/category/s...ipts-programs/