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MilkShape 3D is a popular, low-polygon modeler from chUmbaLum sOft, which was initially designed for Half-Life but has grown to support many file formats and features. 

It has all basic operations such as select, move, rotate, scale, extrude, turn edge and subdivide and also allows low-level editing with a vertex and face tool. Standard and extended primitives like spheres, boxes and cylinders are also available. 

MilkShape 3D includes skeletal animation allowing the export to morph target animation, such as Quake model formats or to export to skeletal animations such as Half-Life, Genesis3d and Unreal.