MALDER. This is a version of ALDER (http://groups.csail.mit.edu/cb/alder/) that has been modified to allow multiple admixture events.
Installation (unix only) svn checkout http://malder.googlecode.com/svn/MALDER malder-read-only
Usage malder -p parfile
MALDER is a modified version of ALDER (http://groups.csail.mit.edu/cb/alder/), the parameter file should be identical to ALDER in its "multiple admixture test" mode
Output The output will be printed to the screen, with lines starting with RESULT_X being the results from fitting X curves to the data. The program will always fit one more curve than is necessary, so if you get RESULT_3, then the lines that start with RESULT_2 are the ones you're interested in.