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XPrivacyLua - Really simple to use privacy manager for Android 6.0 Marshmallow and later (successor of XPrivacy).
DNS leak test - Test your connection for DNS leaks.
App Ops - modifies the settings of "appops" in Android system
privacytools.io - You are being watched.
AppOpsX - AppOpsX is a front-end application for the Android AppOpsService. It allows you to restrict app permissions.
Device Info - Device Info is a web browser security testing, privacy testing, and troubleshooting tool.