Wings 3D is an advanced subdivision modeler that is both powerful and easy to use.

It offers a wide range of modeling tools, a customizable interface, support for lights and materials, and a built-in AutoUV mapping facility.

Erlang
Written in Erlang, an open source, functional programming language distributed by Ericsson.

Winged Edge Data Structure
It gets its name from the Winged Edge Data Structure (WEDS). This is the data structure used to store the adjacency relationships between edges, faces, and vertices in a Wings model.

Open Source
Wings 3D is open source and completely free for use in both personal and commercial projects.