The Tomte tool implements all learning algorithms in order to generate a model from a given SUT.
The current version of Tomte is 0.41 (released September 2016): tomte-0.41.zip
If no real SUT is available you can simulate an SUT from a state machine model using the Sut tool.
The current version of the Sut tool is 0.41 (released September 2016): sut-0.41.zip
Platforms supported: Linux, Windows and Mac OS X
For older releases look here.