From the manufacturer:
Matte Medium - a liquid medium useful for extending color, decreasing gloss and increasing film integrity. It is also used as a nearly clear ground on canvas instead of gesso.
Soft Gel Gloss Medium - thinner than Heavy Body Colors. Mix with acrylic colors to produce a brilliant glaze. Soft gels can be used as a base for wet blending or as an adhesive for collage.
Clear Leveling Gel [formerly Self Leveling Clear Gel] - produces an even film with excellent clarity. It has a unique resinous, stringy consistency resulting from its leveling property. Clear Leveling gel dries to a flexible, high gloss film while imparting a leveling quality to other GOLDEN Acrylic products. It blends well with GOLDEN Acrylic colors to produce glazes.
Fine Pumice Gel - textures dry to hard films. They mix well with GOLDEN Acrylic Colors. Fine Pumice Gel is useful as a drawing ground.
Light Molding Paste - Over 50% lighter than GOLDEN Molding Paste. This dramatic weight reduction is beneficial in creating large artworks and thick layers of material. Light Molding Paste dries to an opaque, matte finish with good flexibility. It is designed to hold stiff peaks for highly textured surfaces and it blends easily with colors.
Crackle Paste - a thick, opaque material that cracks as it dries. The size and extent of the cracking pattern depends on the thickness of application, and environmental conditions during drying and other factors. Dries to an opaque, matte finish, with an absorbent surface suitable for acrylic paints and mediums.
Heavy Gel Gloss - thicker than Heavy Body Acrylic Colors and may be blended with colors to increase body. Excellent for holding peaks.