NVIL

1. Weld

1.1. Weld vertex

1.2. Weld nearest

1.3. Weld Menu

2. Extrude

2.1. Vertex

2.1.1. Extrude plane

2.1.2. Extrude Axis

2.1.3. Extrude cursor

2.2. Edge

2.2.1. 1

2.2.2. 2

2.2.3. 3

2.3. Polygon

2.3.1. 1

2.3.2. 2

2.3.3. 3