From BlenderWiki

Transform

Median

(to be written)

Median Crease

(to be written)

Global/Local values

(to be written)

View

Camera

(to be written)

Clip

(to be written)

Grid

(to be written)

3D cursor

(to be written)

Display

Grid Floor

(to be written)

X Axis

(to be written)

Y Axis

(to be written)

Z Axis

(to be written)

Outline Selected

(to be written)

All Object Centers

(to be written)

Relationship Lines

(to be written)

Textured Solid

(to be written)

Split region in 4 parts

(to be written)

Lock

(to be written)

Box

(to be written)

Clip

(to be written)

Mesh Display

Overlays

(to be written)

Normals

(to be written)

Numerics

(to be written)

Background Image

Image Selector

(to be written)

Size

(to be written)

Transparency

(to be written)

Offset

(to be written)