Any interesting software out there for auto mechanics?

[HeXploiT]

I'm building a rig for a cousin of mine and both her and her husband are auto mechanics & total car junkies. I'm wondering if there are any auto apps out there that I can put on this rig that might be interesting or useful to them.

Any ideas?

 

[VisionxOrb]

http://www.alldata.com/

its exspensive though