Escultor 2.0 -A free low polygon 3D editor with an independent texture management. http://www.geocities.com/miguel_pineda/
Extreme Wave 3D -An ambitious project to create a feature rich, extensible 3D modeling environment. Currently emphasizes povray export for scene rendering, but support for other formats are planned. Program will eventually include a native ray tracer as well.
http://www.tiger-marmalade.com/~james/ewave/
gSculpt - gSculpt is planned to have features for drawing polylines, using translational sweep (extrude) and rotational sweep (lathe/spin) to construct meshes from polylines, and transforming/deforming polylines and models.
Other possibilites include a scene editor, multiple path extrude, and import/export filters for common 3D data formats.
http://gsculpt.sourceforge.net/
Polywog - A free, simple 3D-modeling program creates and edits 3D polygonal objects. Versions available for Win95/NT or Amiga.
http://www.washedashore.com/projects/wog/polywog.html
Sced - Sced is a modelling program that makes use of geometric constraints to edit objects in a virtual world. The scenes created can be exported to a variety of rendering programs, including:
POVray
Radiance
Rayshade
RenderMan(R) compliant programs, such as the Blue Moon Rendering Tools
VRML browsers
http://www.cs.wisc.edu/~schenney/sced/sced.html
Voxel3D - It is a voxel based 3D modeling software, designed for 3D beginner, create models easily by using the 2D painting technique.
http://www.everygraph.com/frame.php
I hope someone can get some use out of these