To install the complete environment on your own server

A couple of years ago I've created a Linux-based virtual machine (VM) for Web/software demos that require a server component (web, db, etc.). It was very easy to carry the VM everywhere and demonstrate the results running an entire client-server environment on my laptop.

Based on this experience, I've created a VM for Drupal site and module developers. (There were some similar systems but they were based on different OS distros and/or they seemed to be a bit abandoned.)