Lotta software out there... some is free, some is useful...
Here is a newcomer that might be both, depending on your needs.
It is direct-editing, similar to Sketchup:
UN-like Sketchup, it outputs some useful filetypes:
It will import STEP files, but not export them.
If you're on a tight budget, Designspark Mechanical might be suitable.
I downloaded it (450MB) but, I haven't tried it yet.
Tried it a bit... quite nice for a free 3D application.
This is not exactly "new", this is a spinoff of Spaceclaim.
http://www.deskeng.com/virtual_desktop/ ... #more-7531