There are a lot of apps out there that pay lip service to security and privacy, but Signal was built from the ground up with the goal of letting people easily communicate without having to worry about being overheard. The Signal app is a complete phone and SMS client replacement (though it works just fine as a standalone app, too) for sending and receiving encrypted calls and messages. A recent update has greatly improved the app's look and feel, proving that security and usability don't have to be at odds. Android App

For developers, it could be a good source of extra income. That said, some developers have reported huge download numbers off the back of the free app of the day promotion, but no resulting increase in sales once the promotion is over. You are also likely to do better with tablet optimized apps than smartphone apps in general, as Kindle users are the primary customers. Android App
You're terrible at passwords. Don't take it personally! Everyone is terrible at passwords. That's why we all need apps like Dashlane, which generate, save, and replay login credentials wherever they're needed. This smart, cross-platform service makes sure that your passwords, payment information, and other vital information is stored securely but never out of reach. Droid App
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