ESmol is an open source software to view 3D structures of proteins, nucleic acids, and small molecules. It supports almost all common molecular representations.

The main function of ESmol is to allow you to view and rotate any object in the 3D space, as well as zoom in and out of the view. You can also search and download any structure from RCSB PDB or NCBI PubChem. 

ESmol is developed with open source software. It is compatible with the Android operating system. It is designed to run on the Android device, but it is not restricted to only Android devices. It is also designed to run on any device with a graphical interface, such as a tablet or a computer.