A Simple Version Control System is an easy to install and use version control system. It is written entirely in PHP and stores data in a SQL database. ASVCS is a great choice for those who not need or want the complexity of most version control systems.
A little TOO simple I'm afraid! True, it's pretty easy to install and use, even elegant. But calling it "Version Control" is an overstatement. It's more like "Version Review". You can't lock files, can't tell who modified them (unless all the users are extremely conscientious about entering version data (they never are)). Actually, since you can't lock files, I'm sure mistakes would be made about who did what no matter how careful you were. There's no labeling, no branching--nothing, really, but a way to make and review notes on whatever updates you made. I suppose for a single user it might be all right in some cases. But for most, forget it!