Alternative Mouse for Hands/Feet/Head and Your Eyes

Trackballs: Oversize trackball: http://www.webaim.org/articles/motor//assistive.php#trackball
Modified trackball:
http://www.rjcooper.com/sam-trackball/index.html

Joy Stick:
EasiTrax Joystick
http://www.traxsys.com
Jouse 3:
http://www.jouse.com/jouse3/home
SAM JoyStick:
http://rjcooper.com/sam-joystick/index.html
TetraMouse:
http://tetramouse.com
Magic Wand:
http://www.magicwandkeyboard.com/

Foot mouse:
FootTime Foot mouse http://www.bilila.com/
NoHands Mouse: http://www.abilityhub.com/mouse/foot.htm

Head pointer:
Headtrack: http://www.abilityhub.com/mouse/headtrack.htm
Head mouse:
http://www.orin.com/access/headmouse/
Tracker Pro:
http://www.enablemart.com/productdetail.aspx?store=10&pid=1279&dept=12
Smart Nav:
http://www.enablemart.com/productdetail.aspx?store=10&pid=174&dept=21
Tracker 2000:
http://www.enablemart.com/productdetail.aspx?store=10&pid=256&dept=22
Trackir Pro: Game controller:
http://www.naturalpoint.com/trackir/

Eye-tracking Control Attachments:
The Eyegaze Edge: http://www.eyegaze.com
Eyetech:
http://www.eyetechds.com/

Audio Control:
Lazee Mouse Pro: http://www.enablemart.com/productdetail.aspx?store=10&pid=1424&dept=21
Switch modified:
Mouse mover: MAC/PC http://www.synapseadaptive.com/switches/tash/mouse_mover.htm

Variation
breath controlled: http://www.abilityhub.com/mouse/joystick.htm
Integra Mouse:
http://www.enablemart.com/productdetail.aspx?store=10&pid=1184&dept=20
Body: motion tracking:
http://www.naturalpoint.com/optitrack/

Software
Hand tremors: Alphaworks:
http://www.alphaworks.ibm.com/tech/mousesmoothing
QualiEye:
http://www.enablemart.com/productdetail.aspx?store=10&pid=174&dept=21