Sleep Cycle - Bio-alarm clock that wakes you up at optimal times based on your sleep patterns.

Snapchat - Real-time picture chatting

Sleep as Android - Common alarm clocks ignore your sleep cycles, they wake you on schedule no matter your are currently in your deep sleep. Waking up from deep sleep is unpleasant, it makes you tired and it may negatively affect your productivity during the whole day.

WebcamMax - Add videos, pictures and effects to virtual/real webcam and broadcast on messengers. It works on all webcam programs and thousands of effects are available. You can share your screen or play movies for others.

Talalarmo - Minimalistic android alarm

Facebook Masks - Spooky augmented reality masks on Facebook Live 💀