Rat is completely modular and because it is open source it can be easily integrated into your own projects. It includes a 3D mesher, a database with material properties, the MLFMM algorithm and a library that eases the modeling of magnets and magnets systems. In addition, there is a library specially made for Canted Cosine Theta magnets, which are often applied in medical accelerators for example.

It can be difficult to get started with Rat Library since it is written in C++ and is most easily run on Linux-based operating systems. Therefore, we at Little Beast Engineering have also developed a Graphical User Interface (GUI). This GUI provides easy access to the Rat Library. It allows the user to build a magnet, and calculate its electromagnetic properties within minutes from the installation! And it's available on Windows, and some Linux distributions.