iOS app to browse APODs. There are already dozens of similar apps in the App Store, but none that I tried provided support for browsing APODs with left/right swipes. This one does. As a bonus, it also allows you to mark APODs as favorites, which are displayed separately from daily APODs.
Android app that used to search for any hashtag across Twitter, Facebook and Google Plus simultaneously. Worked great in it’s glory days, but then Google decided to kill Google Plus and Facebook removed the search API the app relied on. Such is life.
Small extension to EditText in Android that allows toggling the visibility of entered text in password input fields.