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

Noisli - Noisli is a fantastic background noise and color generator for working and relaxing. Online soothing ambient sounds like White noise, Rain and Coffee Shop.

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.

Noizio - Feeling that the noise of the big city is too much for you to bear?

Talalarmo - Minimalistic android alarm

zenmix.io - Ambient background sound generator