The RNAmutants software and web server is free of charge for academic users pursuing non-commercial research. However, any work using RNAmutants, should cite the paper:

Clote P, Waldispühl J, Behzadi B, Steyaert JM
Energy landscape of k-point mutants of an RNA molecule.
Bioinformatics 21(22):4140-4147 (2005)

Commercial uses of RNAmutants are forbidden without the authorisation of the authors P. Clote and J. Waldispühl and require a license. For such uses of RNAmutants, please contact P. Clote.

Binary distributions can be obtained by e-mail request to P. Clote and J. Waldispühl.