Some apps that i know...
Alarm Anti Theft Screen Lock is a sort of hybrid between a security app and a lock screen app. When enabled, it puts an alarm on your device. Then those who try and fail to get passed the lock screen will be met with a loud, obnoxious alarm letting everyone around them know that the attempt to unlock the device has failed. It’s a little old school in terms of design which may clash with today’s more modern interfaces but it does help keep nosy people away.
C-Locker’s claim to fame is its unusual unlock styles. You can get the classic slide-to-unlock or the swipe-up-to-unlock methods if you prefer or you can use the bubble unlock which makes you pop bubbles to unlock the screen by “slicing” them with your finger. You can also change the wallpaper and it is totally free to use without any in app purchases. It’s minimal and simple so those looking for something more feature heavy should probably look elsewhere. Otherwise, tap the button to check it out.
Dashclock Widget isn’t a lock screen replacement but it might as well be one. You can use Dashclock Widget as a widget on your home screen (on supported Android versions) to receive all sorts of data including time, weather, notifications, and a virtual ton of other things from Dashclock Widget extensions provided by other applications. It’s been long touted as a must-have application, especially if you’re on stock Android where the lock screen is a little bare by nature. It’s free so there’s no harm in trying it out.