Strings n Things
"Just where should the suspension points go?" I hear you ask. Rush to your library and take out Alan Staniforth's, Competition Car Suspension: A Practical Handbook.
This file is my take on the famous Staniforth string computer. It's a spreadsheet that has proved to be very useful for estimating roll centres, camber change, track change etc. The roll centre moves with suspension movement. It can't do roll axis, toe change or bump steer. The 3D maths of this is too hard and makes my head hurt.

The file needs a reasonably recent version of Excel to run. Please enable macros when asked by Excel. It's called BonesApart, which is a pun for both sides of the Atlantic and should even make the French happy. Feel free to distribute.
The first tab contains a list of instructions The second tab is the main work area. The third tab shows the instant centres and virtual swing arms.

There are other tools out there such as VSusp Vehicle Suspension Simulator.