SpeedLine Kit is an add-on that streamlines the Freestyle rendering workflow by adding a dedicated panel within the Render properties. It provides three starting presets—Cartoon, Sketch, and Technical—for quickly applying distinct line styles to a scene. Users can adjust primary line properties, including color, thickness, and transparency, directly from the panel. The tool also includes one-click operators to add and configure Freestyle geometry modifiers such as Bezier Curve, 2D Offset, and Sampling to refine line smoothness and positioning.