SunderKand - Valmiki Ramayana is an Android application developed by Prabhu-Stuti. It is a free lifestyle app that provides a detailed, vivid account of Hanuman's adventures in the Sundara Kanda, which forms the heart of Valmiki's Ramayana. The app offers an English translation for some of the Slokas, and users can swipe up or down to replace the Hindi or Sanskrit verses.

In the Sundara Kanda, Hanuman assumes a gargantuan form and makes a colossal leap across the ocean to Lanka to locate Sita, who is being wooed and threatened by Ravana and his rakshasis to marry Ravana. Hanuman reassures her and offers to carry her back to Rama, but she refuses, saying that Rama himself must come and avenge the insult of her abduction. Hanuman then wreaks havoc in Lanka by destroying trees and buildings, and killing Ravana's warriors. He gives a bold lecture to Ravana to release Sita and sets fire to Ravana's citadel before making the giant leap back to Kishkindha.

Overall, SunderKand - Valmiki Ramayana is an excellent app for those interested in Hindu mythology and the epic story of Ramayana.