Unlock your phone and apps with your face and voice using AppLock Face/Voice Recognition.
AppLock Face/Voice Recognition is an interesting app that lets you use your face and voice to unlock your phone and access locked apps. You can decide which apps to lock and unlock using this method, and there's even a nifty "liveness" feature that requires you to move your face to protect against people tricking the system with photos.
Keep your Android phone virus-free with Avast Mobile Security and Antivirus.
Sometimes malicious apps make their way into the Google Play app store, and this comprehensive antivirus app will keep you protected. It scans for and removes viruses, includes anti-theft tracking, lets you lock specific apps with a PIN, and even lets you remotely snap a picture and record audio if anyone steals your phone.
Light Flow lets you hack into your smartphone's LED for custom notifications.
If your phone has an LED light for notifications, Light Flow will let you assign a custom color for when you receive a text, email, phone call, calendar reminder, or even when you're running low on battery.
FoxFi turns your phone into a hotspot without your carrier knowing.
FoxFi is a free Android app that lets you use your phone as a hotspot without having to pay the extra fee from carriers for a tethering plan. It just takes data from whichever plan you've purchased from your carrier. It's unclear exactly how FoxFi does this, but blog Droid Life speculates that it could be using a VPN, or Virtual Private Network, to mask activity from your carrier.
Wikileaks lets you browse leaked documents and files.
Apple removed the Wikileaks app from the App Store, but you can download a version of the app on Google Play. (Just a heads up, it hasn't been updated in years though.) The app lets you browse and dive into Wikileaks' treasure trove of leaked documents.
Lux lets you darken your phone beyond the default brightness setting.
Lux lets you tweak your phone's brightness settings. You can lower the screen's brightness below the default zero when reading at night, and there's Night Mode, which can be turned on automatically at sunset.
Cerberus does a lot more than just let you track your stolen device. You can control it remotely using the website or via text message, sound an alarm even in silent mode, wipe everything, lock the device with a code, record audio from the mic, see a list of sent and received calls, and even hide the Cerberus app so the thief doesn't notice it.
HoverChat lets you message without stopping what you're doing.
HoverChat is a messaging app that lets you continue your conversations even while you're using another app or watching a movie. By resizing and deciding how transparent you want the messaging window to be, you can customize your messaging to fit what you're up to.
Cover removes the hassle of searching through pages of apps to find what you're looking for. Cover senses whether you're at home, work, or driving and puts the apps you use most during those times right on your lockscreen.
Locale lets you customize your phone with crazy levels of detail.
Locale is an automation app, meaning you can customize how your phone behaves based on where you are, who calls you, what your battery life is, the orientation of your phone, or the time. For example, you can set it up so you silence your phone by turning it over, or so that it turns down the brightness automatically when your battery life hits 20%.
Link Bubble Browser could change how you browse the internet.
Link Bubble Browser is all about saving time. When you click on a link online, the app will load it in the background, leaving you free to continue browsing. Once it's done loading, just tap the link bubble and you'll see the fully loaded page.
Tasker is another automation app for customizing every aspect of your phone.
With over 200 built-in actions, Tasker is another great app for deciding what your phone will do when a certain "action" occurs. You can create custom actions based on the app, time, day, location, event, widget, or shortcut, and there's even a built-in platform for creating and selling your own app.
UCCW allows you to design your own widget for your home screen. You simply choose from one of the many skins to create your own look. Then you can choose what the widget displays, with options for text, images, weather, clocks, calendar, battery info, missed calls, Gmail, and more.
Unclouded puts all your cloud storage in one place
Unclouded is a great tool that lets you manage all of your cloud drives in one place. If you've signed up for the free storage on a bunch of services, it can be a pain to constantly maneuver between them. And Unclouded lets explore clean your accounts on services like Dropbox, Google Drive, OneDrive, Box, and Mega.
Drupe brings all the ways you can contact someone into your phonebook.
Drupe is all about bringing your contacts into one place. This app lets you first look at "who" you want to contact, then decide "how," and not the other way around. When you select your contact you can call them, text them, Facebook message them, WhatsApp message them — whatever way you want.
Additional reporting by Steven Tweedie and Lisa Eadicicco
Sliding Explorer is a clean-looking app for accessing files stored on your phone.
Sliding Explorer is one of the best file explorers out there. A file explorer is an app that lets you access files stored on your phone's SD card the same way you would on a computer. So, if you transfer a video directly from your computer to your phone, a file explorer helps you find that video.