Prosthetics > Componentry
There is a huge range of components available for prostheses. Many are interchangeable, but some things such as feet, knee units or liners can make a big difference to your comfort and function. The right ones for you will depend on things like your weight and activity level. Other factors that affect your choice include particular activities you do (eg. is your prosthesis going to get wet), compatibility between parts, cost, other medical issues, aesthetics and of course your preference.
Below are links to articles outlining different componentry and technology.
Component Companies
Ossur http://www.ossur.com/
Otto Bock http://www.ottobock.com.au/
Hanger http://www.hanger.com/
Ohio Willow Wood http://www.ohiowillowwood.com/
Freedom Innovations http://www.freedom-innovations.com/
College Park Industries http://www.college-park.com
O & P http://www.oandp.com
Endolite http://www.endolite.com
Touch Bionics http://www.touchbionics.com
Utaharm http://www.utaharm.com