low poly modeling - modeler shell (Score 2, Informative)

if youre looking for a cheap solution, try mosh http://www.jimbomania.com/mosh.html it uses blocky opengl primitives (glutSolidCube() & Tetrahedron & Sphere() ) in pseudo-opengl code, saved as text. you will have the disadvantage of using an unfinished piece of software, but the advantage of heavy influence ofver the future design of the code/interface.