Ribosome is a nice, simple program for constructing a structure from a sequence.


It is free and can be obtained from http://roselab.jhu.edu/~raj/Manuals/ribosome.html and installed quite easily.


Once installed, it is useful to set the Ribo environment variable:


>export Ribo=/usr/local/Ribosome     # or wherever it happens to be


and include the src directory (or wherever you put the executable) in your path:


>export PATH=$PATH:$Ribo/src


The documentation can be found at the above web site and at $Ribo/doc/ribosome.html