A downloadable tool
GuizmoMovements is a free script to get the ability to move, rotate and scale and object, holding a mouse button and drag it.
You can find a demo scene into the package, that is a good start to understand how it works. Also see the videos is a good idea. And also a prefab example, to drag on your scene.
Working in Unity? Maybe you interest this stuff:
Click download now to get access to the following files: