Subject: searching for open source php module

hi, i am looking for an open source php module that does some simple content management. it seems that something like this must exists, since it is a pretty common need, but i'm not sure where to find such a thing. here is a description of the functionality i am looking for: ability to update many page withing a website with content unique to each, hopefully with versioning for each of these pages (so that previous versions can be referenced or reverted to). in my thinking, each page is just a single text field that the updater fills in on the backend of the site. it also would be usefull if the module took care of paragraph breaks without makeing the user type in html. as you can see, this is a very very simple module, and i would just write it myself except that it seems like someone may have already done so. let me know where to look (or for something similar, since i can easily mod anything that's out there), and also if there is a good resource for open source php projects of this type. m.