After Effects
More info here
Script and plugin combination for doing snap transformations inside trueSpace 7.61. It will move an object/element selection to the center location of another object/element selection.
Recreate some of the alignment and distribution functions of Inkscape to organize the locations and rotations of objects in a scene.
Comes pre-installed in the Unofficial Updates
Adds a visual indicator of the meshes origin for object navigation and point edit widgets and adds a center sphere for the point edit widgets.
To scale the object about the origin instead of it's center use Ctrl + LMB or Ctrl + RMB on the scale handles.
Ctrl + Left Click the sphere of the point edit widget and the origin will move to the center of the selection.
Widget based snapping requires that the Mesh Origin script is installed.
Comes pre-installed in the Unofficial Updates
Mirror tool that effects the object matrix values. Similar to the built in modeling mirror tool but mirrors the matrix values as well as the vertices. This tool is also compatible with cameras and lights.
persistent base install required
Select a scene item then choose an axis and press the Mirror button.
Mirror Copy - make a copy and mirror it
Mirror Mesh Vertices - a mesh requires that the vertices are updated for a full mirror effect. Can be disabled to only mirror the matrix values. This option is ignored for cameras and lights.
Script for transferring the matrix from one object to another. It moves the location, rotation and scale of one object to another. Original idea by MikomDude and icon supplied by Draise. United3DArtists thread here .
persistent base install required
Select 2 or more objects and press the button. They will move, rotate and scale to the last selected object. Right click for options. The Use Local Space option can be used for grouped objects to move the members relative to each other.
Freeze transformations script. Set rotation to (0,0,0), set translation to (0,0,0) and set scale to (1,1,1) and set shear to (0,0,0) without changing the appearance of the object.