Battery Spy
Battery Spy provides a visual representation of several key battery usage statistics. It can check the current state and charge level of the power source and track consumption over several days. Notifications can also be set when the battery level or temperature reaches user-defined thresholds. Battery Spy supports profiles, so you can monitor your primary and backup batteries.
What we like: Customizable 2D or 3D graphs representing usage statistics over time.
Cool Tool
Cool Tool allows you to monitor numerous system parameters right from Android’s Action Bar. Some of the subsystems that Cool Tool monitors include CPU load/frequency, memory usage, Wi-Fi/cellular network traffic, SD card capacity, battery level, cellular signal, temperature, and more.
What we like: An always-on, user-configurable system monitor.
Total Commander
Total Commander is the Android version of the famous desktop file manager by the same name. This app allows you to create/rename/copy/move directories, delete files, compress/decompress, search files, send files via Bluetooth, and basically every other primary function of a file manager. LAN, FTP, and WebDAV plugins for Total Commander are also available on Google Play.
What we like: The comprehensive file management options, and robust plug-in system for adding even more functionality.
File Manager HD
File Manager HD is, as its name suggests, a file manager for Android tablets. Like all file managers, File Manager HD can cut, copy, paste, compress, decompress, and search for files and directories. But it also has a built-in text editor. File Manager HD supports networked file systems over LAN or SMB, as well as several major cloud storage solutions, including Box, DropBox, Google Drive, SkyDrive, and SugarSync.
What we like: The folders, sidebar, and navigation bar work well on tablets, and will be immediately familiar to any desktop user.
eFile
eFile is yet another file manager option for Android. On top of the usual capabilities enabled by most file managers, eFile allows file sharing via Wi-Fi and supports drag and drop (via press and hold). The top and bottom toolbars with pop-out make good use of the limited screen real estate available on smartphones.
What we like: Thumbnail view for image files, and drag and drop support.
Astro File Manager / Browser
Astro File Manager / Browser is one of the most popular file manager apps for Android. It allows you to browse or search for files on your Android device, local network, Box, DropBox, Google Drive, Facebook, or SkyDrive accounts. A directory path in the uppermost toolbar makes backward navigation a snap.
What we like: Integration with most major cloud storage services.
3G Watchdog
3G Watchdog measures your mobile data consumption over GPRS, EDGE, 3G, and 4G networks. You can also get a detailed daily, weekly, or monthly report on your usage.
What we like: The notification icon that changes color and historical usage reports.
Call Meter 3G
Call Meter 3G gathers statistics on calls, text messages, and data consumption. This app also allows you to set limits for each type of communication service.
What we like: The simple usage breakdown and alerts.
Quadrant Standard Edition
Quadrant Standard Edition is a simple system (CPU, GPU, and I/O) performance benchmark.
What we like: Easy to compare devices...and brag to your friends about your latest purchase!
Uninstaller
Anyone can install an app, but completely and fully uninstalling them often requires a helping hand. That’s where Uninstaller comes in. This app cuts through the sea of differing menus on the various Android spins to provide a simple way to uninstall software.
What we like: Simple and effective removal of unwanted apps.
