CloudCompare is a powerful, open source 3D point cloud and mesh processing software available on all major platforms (Windows, MacOS, Linux). It is my current favorite tool for visualizing 3D point clouds.
One thing that bothers me about macOS is the lack of the side-by-side “window snapping” functionality that is built into any modern version of Windows and in many Linux windows managers. I often see co-workers manually dragging and re-arranging windows on their screen. BetterSnapTool is a $2.99 app that does exactly this, and much more.