GRALE is set of tools to model gravitational lenses and invert gravitational lens systems based on the observed images.
The following articles involve the use of GRALE:
The new version consists of a set of core libraries in C++, together with Python bindings to make the use more flexible.
The original software is of course also still available. The file formats used should be compatible between the versions, which is very useful as not all software (e.g.the Grale editor) has not been ported to the new version yet.