Friendliest console installer EVER!
This is the friendliest console-based-installer I've ever used:

I love the way it keeps the stress down by saying stuff like: "But don't worry, this installer will tell you how to ...". Very friendly indeed.
It's for Phusion Passenger - a module for hosting Ruby on Rails apps in Apache. Credit to the makers. It makes hosting Rails totally simple. I just switched from using modproxybalancer and mongrel, and it's a walk in t' park so far.
Comments
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Is this an installer written specifically for the module or can it be used for other console apps/scripts?
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Yes, and I found the instructions accurate also. For Ubuntu it instructs you to use apt-get, for Gentoo it gives instructions with emerge… very nicely done.