Good idea for a thread, Ger. It's good to have a list of these readily available for anyone who needs them. There are even a couple on your list I didn't know about. If anybody else knows any, please feel free to share.
http://www.wings3d.com/
Wings 3D is an open source box modeling (one of the easiest forms of 3D modeling) subdivision modeler that is quite powerful and has a lot of great features.
http://www.kerkythea.net/joomla/
Though not a modeling program, Kerkythea is a free and powerful rendering program that comes in handy if you're using a freeware program like Wings, that has a powerful modeling engine but lacks in the rendering area.