Have a look at the ones listed below. I only included links for the free and budget ones. If you're willing to drop some serious cash then google the pro stuff. For a beginner I highly recommend the Cubify range...

Free:

FreeCAD
123D Design
Creo Elements/Direct
SketchUp
OpenSCAD
BRL-CAD
SolveSpace

Budget:

Cubify Invent
Cubify Design
Cubify Sculpt
Moi3D
VariCAD
SolidFace

Pro:

SolidWorks, Creo, Catia, Geomagic Design, SolidEdge, TopSolid, NX, Inventor.