Does anyone know a tool used for RNA structure validation; an etha-theta plot such as the ramachandran plot for proteins?

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Sachin A. More

U can use GeneBee database regarding the secondary structure of RNA and further analysis

Mohamed Ameen

U can use MolProbity (http://molprobity.biochem.duke.edu/) for RNA to validate models based on clashscore

Chris Oostenbrink

We have recently published a structure classification tool for RNA and provide statistics on the various structure elements that are observed in experimentally determined structures. Please take a look at:

https://www.researchgate.net/publication/259454002_Dihedral-based_segment_identification_and_classification_of_biopolymers_II_Polynucleotides?ev=prf_pub

You can download DISICL from http://disicl.boku.ac.at/

Article Dihedral-Based Segment Identification and Classification of ...