The
SDP-SI catalog has lots of different pulleys of various tooth profiles, pitches, tooth counts, etc. and if you click the part number you can find a CAD download in the window that pops up. At the very least this gives you the tooth profile which you could rework into other pulley geometries (different hubs, flange/no flange, etc.).
However, usually you don't care about the actual tooth profile so you could just create part files with all the other geometry (hub diameter, length, pitch diameter, etc.) and put those in the model. Solidworks has a belt feature under Insert>>Assembly Features that allows you to route an "imaginary" belt (it just shows a line) that you can use to measure the length. I'm certain similar tools exist in Pro/E/Inventor.