Curves > Blend Curve Toolbox Shows or hides an extra palette window containing tools for creating and editing blend curves.
BlendCrv Tools > Blend Curve Create Lets you create new blend curves in the scene by placing location constraints. You can also use this tool to edit existing blend curves.
BlendCrv Tools > Blend Pt Make Master Changes the relationship between the picked blend curve constraint and any constraints that it depends on. May reshape the curves.
Curves > Keypoint Curve Toolbox Shows or hides an extra floating palette containing tools for creating and editing keypoint curves.
Keypoint Curve Tools > Circular Arc This tool enables you to specify a circle by first placing its center point, and then clicking to indicate a point that lies on the curve.
Keypoint Curve Tools > Ellipse Lets you create a keypoint ellipse by drawing the two major axis points, or by drawing a center point and a major axis point.