Ra2dTomo is a tool for 2d refraction tomography. It is able to incorporate arbitrary surface topography by the use of unstructured triangle meshs. It reads several formats (reflex, gremix, tom and own formats) and allows the user to specify depth and fineness of the model. Usually a gradient type starting model is applied to enable ray coverage. Several inversion options can be chosen as lower velocity limit, smoothness or robust data inversion or blocky model constraints. The result can be exported to eps/pdf Files. Different display modes reveal insight into the data.