Power Nap App - Best napping timer with relaxing sleep sounds
Noizio - Feeling that the noise of the big city is too much for you to bear?
Rain Room - Listen to curated rain recordings to feel relaxed and cosy
Noizer - Ambient sounds like Noisli, but free
Sleepy Baby - Help your baby sleep with the Sleepy Baby soundboard.
Defonic - Create a unique sound environment at home or in the office