A helical anchor or screw anchor is a type of earth anchor. Various types of earth anchors are used in geotechnical engineering projects. Helical anchors can be used for compression and tension forces in various conditions of vertical, horizontal, and inclined directions. As this type of anchor does not require excavation and injection, a new term “Green Anchor” is defined in this manuscript. Helical anchors can be used as a foundation in various projects, thus they can be considered as a “Green Foundation” rather than existing methods and technologies of foundation construction. Plate anchors and grouting anchors need excavation and injection for installation. In this paper, a review of various design methods of helical anchors such as the single bearing capacity method, the cylindrical shear method, and the installation torque method in cohesionless soils is presented.