Lock

Lock the screenApache-2.0

Private Lock

Lock your phone from its movement forceGPL-3.0-or-later

App Lock

Secure your sensitive apps with powerful biometric protection using AppLock!MIT

Pineapple Lock Screen (OSS)

Help you turn your phone screen off (lock screen) without using power button.GPL-3.0-or-later

Paranoid's Pal - Privacy Lock

Unlock Privacy, Secure Your WorldGPL-3.0-or-later

PluckLockEx

Lock your phone when snatchedMIT

FallASleep - Device sleep timer

Lock the screen after a timer runs out.MIT

Quick Ball

A Quick Action Ball that gives fast access to controls —volume, brightness, lockGPL-3.0-or-later

Todo

Secure offline To-Do & Notes with biometric lock.GPL-3.0-only

Privacy Flip

Manage your device privacy based on lock/unlock stateGPL-3.0-only

Secure photo viewer

A media-viewer that functions on top of your lock-screenMIT

Oblivion

Remote lock and wipe triggers for compromised or unattended devices.GPL-3.0-only

Wasted

Lock a device and wipe its data on emergencyGPL-3.0-only

Cryptomator

Put a lock on your cloud: Take the security of your data into your own handsGPL-3.0-only

Caffeinate

keep your phone's screen On while developingGPL-3.0-only

Webview Kiosk

Turn your Android device into a locked-down web page in fullscreen mode.AGPL-3.0-or-later

Notesnook - Private notes app

A fully open source & end-to-end encrypted note taking appGPL-3.0-only

DuressKeyboardLite

Keyboard with DuressPassword feature.Unlicense

ProximitySensorFix

simple fix for during call proximity sensor issuesGPL-3.0-or-later

GPS Cockpit

GPS Cockpit & Head-Up DisplayAGPL-3.0-or-later