Select By adds a range of selection options to Blender's built-in tools through a dedicated Select By menu. It lets you store a selection and recall it later with Restore Selection, and includes Find Copy, which selects every item in the scene sharing the same name as the object you pick in the viewport.
The add-on can select mesh objects by their polygon count, vertices, or edges using parameters such as fewer than a set number of vertices or greater than or equal to a value. Same PolyCount selects objects matching the polygon count of the active object. Further options cover scale larger than one, negative scale on any X, Y, or Z transform, and negative X, Y, or Z location.
Material and rendering filters round out the set: select objects with no material slots or with materials applied, or those that have modifiers enabled. You can disable or enable selected objects in the render engine, lock or unlock Location, Rotation, and Scale, and use Print Mesh Data to output polycount, vertices, and edges for objects in the blend file.