RnallViewer is an RNA analysis and visualization tool that combines information and processing from various command-line tools in an intuitive graphical user interface (GUI). Rnall is used for generating RNA structure predictions, which can be automatically sent to Naview, plt22ps, and Ghostscript for visualization. Annotation information can be included, parsed with the help of BioJava. RnallViewer’s panelling system allows much of this information to be displayed simultaneously, and comprehensive searching methods allow quick access to specific regions based on annotation and position criteria in the format of NCBI ptt format