SoDragger(3) on Linux
The text aaf37d73a46a, as Debian 6.0 (Squeeze) shipped it.
The SoDragger class is the base class for all draggers. Draggers is a mechanism used for letting the end-users of your application code interact with elements in 3D, by scaling, rotating or translating geometry or other instances in the scene (like cameras or lightsources).