Firefox is lickety-split fast and has a clean design that is a joy to use. Mozilla makes a big point about how it doesn't collect your data, and we are pleased to see that the app comes with a full complement of security settings—including an option to protect your information from advertisers and a private browsing mode. Like the desktop version, Firefox for mobile has a robust selection of plug-ins, excellent tab management, and a dynamic start page for bookmarks and the latest headlines. You can even sync settings, history, and tabs with the desktop variant Android App
Here’s an interesting alternative app store that offers a large collection of curated apps. Mobogenie boasts an intelligent recommendation engine that’s supposed to analyze your preferences and make sensible suggestions. The interface is good, access is offered globally, and there’s no registration. Mobogenie also works as a file manager, and it allows you to download other content beyond apps such as wallpapers, ringtones, books, and YouTube videos.
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.
Remember the bad old days of ordering food? You needed takeout menus, knowledge of the terrain ("will they even deliver out here?"), cash, and faith that the person jotting down your order got it right. Seamless takes care of all that, even letting you pay via credit card from your Android. The only drawback? It's not available in every city (or even every state), though it has expanded its range dramatically since it was first included on this list. Droid App