Frog2 (Free Online Drug Conformation 2) is a service aimed at generating 3D conformations for small molecules starting from their 1D, 2D or 3D descriptions (smiles, sdf or mol2 input formats). Frog2 improves upon Frog1 by embedding new energy minimization and ring generation capacities.
The Nucleic Acid Database (NDB) Tools page includes RNAView and BPView, programs for the visualization and classification of RNA base pairs, motifs, and structures.