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

FriendFilter - Auto unfriend tool for Facebook

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.

Detox for Facebook - Replace your Facebook feed with PH, HN, DN and more.

Talalarmo - Minimalistic android alarm

Keep My Friends - A lightweight, personal CRM to improve your relationships