It's not exactly new and exciting, but I found that listening to calm, instrumental music helps me focus. Mostly Ambient. If you do not like electronic music, Stars Of The Lid or Bohren & Der Club Of Gore are very much worth checking out.

Also, https://mynoise.net/ has worked wonders for me.

In both cases, it seems that unstructured audio input, like, occupies the parts of my mind that would otherwise distract me.