This is a paid asset, but now you can download Transform Tools Free.
Detail this asset from Unity Store: Original Link
Transform Tools v1.6
Transform tools is an editor extension designed to make object placement faster and easier.
Documentation | Support Forum
• Align and distribute. Easy to use tools to align and distribute game objects. Similar to the tools you can find in Illustrator, Photoshop, Inkscape, and others.
• Grid arrangement. Arrange objects on a 3D grid.
• Radial arrangement. Arrange objects in radial patterns such as arcs, circles, ellipses, and spirals.
• Rearrange. Swap the positions of the selected objects.
• Progressions. Incrementally change the scale, rotation, and position values of the selected objects.
• Randomize. Add random values to the position, rotation and scale of each selected object.
• Homogenize. Even out the spacing, rotation and scales values of the selected objects.
• Center pivot. Center the pivot of 3D objects, sprites and UI objects.
• Edit pivot. Edit the pivot position and rotation of 3D objects, sprites and UI objects.
• Place on the surface. Place objects on the closest surface in the direction defined by the user.
• Simulate gravity. Physics based placing tool.
• Remove overlapping. Move objects far enough so that they do not overlap.
• 2D and 3D. All tools can be used on 2D and 3D objects.
• Runtime functions. Static class for calling methods at run time.
3D and 2D assets in the videos are not included in the package.