The only things I know which could do this are CMSes - I've had the same problem as you but unfortunately the more complicated are the better ones security wise and updates wise and plugins wise usually.
Have you tried something like this -
Download Limeware 0.6.7 - Limeware is a free, lightweight, user friendly MySQL and PHP content management system - Softpedia
I can't vouch for it as I've never used it but seems basic enough (and its free).
Or you could try something like Wordpress - that is quite simple without all the add ons which you can disable.
hope that helps
