Inivis is the developer of the popular AC3D application for Windows, Mac and Linux and the new Spherize plugin adds great new capacities to the tool.
The new Spherize plugin for AC3D 7.5 takes selected vertices and moves them so that they form a sphere. The tool is very useful for creating quad-spheres which form a good basis for a lot of subdivision surfaces modeling.
A forum posts notes that Spherize is also handy for making round surfaces or holes or distorting geometry.
Inivis has also been working with the developers of the computer game X-Plane and have announced the latest version of the X-Plane plugin for AC3D 7.5. The latest plugin is version 3.3b1. It adds support for the new X-Plane 10.50 Manipulators.
The latest version of AC3D version 7.5 adds many new or improved features, such as support for the new Spherize plugin, useful for subdivision modeling, plus File Holes functions for objects, Unify Normal, and better hierarch and wildcard object searching and more.
You can learn more or download the latest version here.