Every aspect of this uses open-source software. Multiple programming languages and software systems are used throughout the project.
The server is running Ubuntu Server (C and assembly language). OpenSimulator application server (C#). The service is accessed through client viewers, such as the Firestorm Viewer (C++). Web services use HTML, CSS, JS and PHP.
Inworld content scripting is written in C#, VB, LSL and OSSL.
Closely related to the main project are interests in the Blender Foundation and Gimp. Blender and Gimp are two of the most common tools used for in-world content creation. The involvement of these two brings python heavily into the mix.