Isometric Line Tool plugin
version 10.0.1

2001-2003 Rick Johnson/Graffix
http://rj-graffix.com

This plugin adds a tool in the tool palette in Adobe Illustrator 10.0 and above. With this tool, you can click and drag to draw a straight line constrained to 30, -30, or 90 degrees for isometric drawing. Hold down the shift key to constrain lines to 45 degrees, or the option key to draw straight lines without constraints. 

To install this plugin, just drop it in your Adobe Illustrator Plug-ins folder.
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What the heck is Graffix? Some huge corporation? Nope. It's me, an illustrator, and one room where I do my work. You see, I'm not only the programmer and Webmaster, but I spend most of my time actually using the tools I create.

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Legalese:

This software may be freely distributed provided 1) no fee is charged for it and 2) the software is accompanied with this file, both unaltered from the original.

Rick Johnson/Graffix assumes no responsibility nor liability for any damages or consequences arising from the use or misuse of this software. Heck, if the wealthiest person in the world and the largest software company on earth can't guarantee smooth sailing under any unforeseen conditions, how can an illustrator in Wisconsin do that?