My master pack of cimpletoon unit graphics and creation tools
isocams.blend is a rig of 8 cameras to render cimpletoon units.
It is best for animated models
isorender.blend is a rig with an animated camera that renders 
all 8 directions at the push of a button (two, actually. Ctrl and F12).
Just load your model, scale it to fit (if it fits in frames 1 and 3, 
it usually fits in all of them), and render animation.
isorender64x48.blend is the same as isorender, but renders in the more standard
64 by 48 px size, as opposed to 64 by 64.

xxx.spec is a specfile that makes it easy to add your units.
Just open the spec file, change all instances of "path" into the path to the 
folder which holds the images, with respect to the freeciv data folder. Then change all instances of "xxx"
to the name of the unit. Add the xxx.spec file to cimpletoon.tilespec and you should be good to go.
It is usually a good idea to put xxx.spec in the same folder as the eight pictures, or to rename it to the name of the unit.

if you copy the units folder, cimpletoon.tilespec, and toonhex.tilespec to your data folder, all you need to do 
is change the xxx.spec files in the folders in units as you wish, 
and the units in the folders will be added to your cimpletoon and toonhex tilesets.

unzip this into your data folder. 