5 axis cnc design

http://www.kickstarter.com/projects/1091976372/open-source-5-axis-cnc-router-and-plasma-machine-p

This is a nice build. Good work envelope.  Need to check back later and see if he has updated the resources.

http://diylilcnc.org/

This is another project worth looking at. Seems to be struggling a bit and may die from lack of interest. Its not particularly unique either.

Logisim Tool

http://ozark.hendrix.edu/~burch/logisim/index.html

Need to have a look at this in depth.

Another Hardware Hacking site

http://www.buildlog.net/

Seem interested in xy lasers. Good info.