MERLIN is available free for both commercial and non-commercial use, no license is required.
However, note that no redistribution of the MERLIN source code or binaries is allowed.  If 
you do use MERLIN, please register at http://www.sph.umich.edu/csg/abecasis/Merlin/

Why should I register my copy of MERLIN?

Well, all software programs are buggy... and MERLIN is probably no exception. If we find 
something wrong, we need your e-mail address to let you know. This information is also used
to gauge the level of interest in the project and helps decide whether to invest time making
MERLIN even better or, perhaps, go back to the lab and do some real work.

How do I reference MERLIN?

To reference MERLIN, please cite:

Abecasis GR, Cherny SS, Cookson WO and Cardon LR (2002). Merlin-rapid analysis of dense
genetic maps using sparse gene flow trees. Nat Genet 30:97-101.