Noise cancelling headphones is something a lot of people use.
Angle your desk/screen away from other people's eyelines or things that distract you. One place I worked I was right in front of the kitchen area and that was very distracting. I moved towards a window and that was better because the seagulls didn't tend to distract me.
Another thing I love is a standing desk. I can work in my busy kitchen at home and grab enough focus while a million things are buzzing standing up at a laptop. Don't know when, but realized that and now I prefer to have a dual standing/non-standing desk in open offices as well.
Naturally, that can be a bit awkward in an open space so you have to make sure you're not then distracting everyone else.
