Zmodeler -

Move edges along the surface of a model without affecting the overall shape. Slice: Cut new edges into the mesh based on a drawn line.

Quickly add thickness to polygons or bevel edges/faces to create complex hard-surface shapes. ZModeler

Easily add resolution to your model by inserting single or multiple edge loops across the mesh. Move edges along the surface of a model

Right-clicking or pressing the spacebar while hovering over a component (point, edge, or face) brings up a customized menu of available actions for that specific type of element. ZModeler