After a long time here is an update! There is a new version of the CollMaker (extended options) and the CollViewer, which displays all collision files correctly now.
Furthermore you can find a few screenshots of the CollEditor, on which I am working at the moment. It will make it possible to view collision objects in 3D and to change some properties.
Tags: collmaker, collviewer, update, collision, col, colleditor, modding, gta3