IO-Toolkit is a library providing an input/output interface that allows for easy storage of data. While the server owner does not have to bother installing a plugin, you, as a plugin developer, can simply include this library into your own projects.
There is a tutorial about how to use this. It may look a bit scary at first, but this is actually quite simple.
There is an additional page, solely dedicated to the installation of this library. Click here to get there...