Many of the utilities in Ubuntu Linux use a text editor to allow you to edit configuration options and files. An example of this is using the crontab command, which allows you to edit your cron jobs using the default editor.

It's really easy to set the default editor using the update-alternatives command. Open up a terminal window and type in the following command:

These are the Linux distributions I've downloaded over time. Most of these are standard ISO files, although some distributions may have additional documentation or MD5 files with them.
As I continue to download them, I will provide links to documentation and the MD5 files.
Shortly, I will place more information about MD5 hashes, on the utilities web page.
Additional information can be obtained from DistroWatch (http://www.distrowatch.com)
Damn Small Linux

1. 1. v0.4.4

DSL v0.4.4 (Main Disk Image)
MD5SUM
Summary Info

2. 2. v0.5.1

Sometimes when you're building a system, you want to be able to close the list of packages that are installed on another system.

Debian provides some great utitlities to manage their packaging system (apt, synaptic, etc). They also provide the dpkg suite of utilities as well. In this case, the command:

dpkg --get-selections

will return a list of packages that are currently installed on the system.