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File Manager HD
I need a file manager because ... well, because I can't have one on iOS, and I happen to like rooting through the file system.
I went for File Manager HD, not only because it was cheap, but because it does what it says it will do on the tin, and also integrates with cloud services such as Dropbox, Box, Google Drive, SkyDrive, and SugarSync.
I'm not paranoid, but I think that putting things in the cloud without encryption is just plain asking for trouble, especially if that information is sensitive.
Enter BoxCryptor. What does it do? It is encryption software optimized for Dropbox, Google Drive, and Microsoft SkyDrive. With BoxCryptor for Android, your AES-256 encrypted Dropbox, Google Drive, or Microsoft SkyDrive folder can be easily accessed from your Android device.
AVG Mobile AntiVirus Security Pro
I'm not overly concerned with mobile viruses, but I'm also careful enough to like the idea of a little extra protection.
AVG Mobile AntiVirus Security Pro not only offers protection against malware, but also gives me the ability to remotely lock and find my Nexus 7 if I leave it in a bar somewhere. And if someone else decides to take it, I can make the errant tablet emit an ear shattering noise, even if muted, or even remotely wipe it if the worst comes to worst.