VariCAD Viewer
STP Viewer
A360 VIEWER
Glovius
IGES2STEP
IDA-STEP v4
PartXplore
ENSUITE-VIEW
Vim Python IDE
VariCAD Viewer
Vim Python IDENo features have been listed yet.
STP Viewer - Free STP Viewer - free software that lets you view 3D STEP files (.stp, .step file format).
A360 VIEWER - Free online CAD Viewer
Glovius - Extensible & customizable 3D viewer, for consumption of product design data.
IGES2STEP - Freeware CAD file viewer for Windows XP/2000/NT
IDA-STEP v4 - Iges2step is a free and elegant CAD viewer application for Windows.
PartXplore - The most powerful, high-speed?CAD file viewer and analyzer