What riveting methods are available for sheet metal?

The most common is pop riveting, where a rivet is pushed into a pre-punched hole with a tool and the rivet is deformed on the back side. There is also Henrob riveting, where a machine makes the hole and simultaneously pushes the rivet in so that it stays in place. Stucco riveting is another variant, in which two materials are pressed together and a rivet is moulded from the materials without forming a hole.