Mac: Ever wished your Dock had more levels? Station is a replacement Dock that allows you to create groupings that can then be stacked up into multiple levels. Station is a Dock substitute, but you can set it up to live on the bottom, left or right of your screen. Once you do, you add apps to the main Station area, and then you can create separate folders that open up different levels. For example, if you're a programmer, you might have a set of your coding apps on one level, then design apps on another. You can have up to 10 levels open at once, though that's likely overkill for most people.
Station's an interesting premise, and even though most of us don't need to have this level of organisation in the Dock, it's useful for some people. Either way, you can check out a limited demo of Station to decide if it's something you'd use.