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

Facebook friends feed - Facebook with stories only by friends and pages you follow

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.

FriendFilter - Auto unfriend tool for Facebook

Talalarmo - Minimalistic android alarm

Detoxify App - Detox from your most addictive apps