RNANR stands for RNA Non-Redundantly. It is a software that allows to exhaustively generate all locally optimal secondary structures of given RNA sequence using Nussinov energy model. It also contains non-redundant sampler (hence the name, though exhaustive generation is also in itself non redundant ;)) which returns samples based on their Boltzmann probability, which is computed using Turner energy model.
To access the source code of RNANR, please visit this link:
For more information, please see README located in there. This will give you description of an installation process and of options you can use.