These (all free) apps provide a special advantage for me …
This app can measure the webtraffic for a certain period of days (example 30 days).
The built-in function in Android allows only full month.
alternative to Winzip
(Winzip turned out to request too many permissions that cannot be explained with its functionality.)
(Sony Mobile Communications)
records in adjustable quality in the acc-format
(requires no permissions)
Encrypted Data Store
for KeePass Password Safe
(comparable with Google maps offline)
Office Documents Viewer
In the preinstalled camera app the shutter sound could not be turned off (except to mute the smartphone).
This camera app works without shutter sound.
(for older Android versions)
most of the apps are used with
Android 4.4.2 on Samsung Galaxy S3 neo (GT-I9301I)