Recently I have been using Noisli to help me concentrate on work.
Usually when working I listen to the radio (mostly plays, comedy or documentaries), or podcasts. If I really need more concentration, I listen to music. But sometimes even that's too distracting - but silence can be distracting too.
So Noisli plays background noises for you.
I've been listening to the rain and a train. You can also have the sea, wind, thunder, leaves, fire, coffee shop background...
Oddly, it really does seem to help!