Blender Auto LOD automates level-of-detail setup across an entire scene. The add-on applies a decimate modifier to all objects in the scene, then calculates each object's decimate value automatically based on its distance from a main object you select. The aim is faster renders and a smaller memory footprint in your file.
The controls stay simple. You can choose the main object, set a minimum decimate value, and define the range from the main object. A single click removes every decimate modifier the add-on has added. For very large scenes, the calculation can take Blender some time, so raising the number of Steps updates the decimate fewer times as you move objects around, keeping the process quicker.
The add-on is released under the GPL license and comes with documentation. It supports a range of Blender versions from 2.8 through 3.1, covering older releases alongside more recent builds.