Mars Explorer is a free and open source app that retrieves imagessent from the three rovers currently on Mars - Curiosity,Opportunity, and (now defunct) Spirit and displays them neatly forthe user to browse. App Repository -https://github.com/krtkush/MarsExplorer

Linear Timer is a custom view library for Android that createscircular progress animation with respect to a given duration. It isa free and open source library. Find out more about Linear Timer onGithub - https://github.com/krtkush/LinearTimer

Lernen is a content distribution platform for schools andotherinstitutes. Lernen has an in-built Podcast player which onlyservescontent uploaded on startlernen.com