My answer to "Can this be easily integrated into an existing site?"

This is my answer to a Question on Support site for LampCMS project

Yes, the latest releases of Lampcms make it easy to install in sub-folder of existing website. There are configuration options to define the sub-folder path.

It's also easy to install lampcms libraries in any directory on your server, then just define path to libraries in bootstrap.php

This makes it very easy to host multiple Q&A websites all powered by a single Lampcms distribution. Each site will have own copies of templates and css so you can make them all look unique while still using a single copy of lampcms core library classes.

All you have to do is hook up your existing site's registration/login to the Lampcms. This is a bit of a custom work you have to do but it's not all that difficult if you know how to program in php or know someone who does.