Zoo Tools Pro also previously known as the C3dC Prefs are a suite of Maya tools, hotkeys, and settings that will maximise your workflow in Maya. Zoo Tools Pro v1 comes free with any site purchase, it is a commercial product and has no expiry date. Note that we are currently working on Zoo Tools Pro v2 where our licensing will change.
The developers pointed out that toolsets are only one aspect of Zoo Tools 2. The update will also bring new auto-rigger, browsers for image-based tools, preferences windows, trigger marking menus, hotkeys and more.
suite of Maya tools, hotkeys, and settings that will maximise your workflow in Maya