Basic Android security setup guide
Basic setup guide for Android devices
Android Privacy Guard (APG) for Android devices
Encrpyt files on your smartphone
K9 with APG for Android
Smartphone email client
KeePassDroid for Android
Smartphone password manager
ObscuraCam for Android
Blur or delete faces from photos
Orbot for Android
Tor for smartphones
Orweb for Android
Browse the web anonymously
TextSecure for Android
Encrypted text messaging
RedPhone
Safe VoIP