...If you do have it, you can simply download the source files and run them.
The following program was built as a final evaluation project for Programming for Mechatronics Course for my BSc. in Mechanical Engineering. This solver is based around the Gauss-Seidel algorithm for 2D heat transfer for pre-determined boundary conditions (i.e. user defined temperatures). I hope this project will be useful for illustrating this type of 2D heat transfer problems. This project uses jpeg2pdf open source converter by Dmitry Markin and Haohu (hosted on SourceForge as well).