For osx, https://selfcontrolapp.com https://selfcontrolapp.com is also useful for blocking 9gag/Reddit/Facebook, but it will still let you get on stackoverflow

For osx, https://selfcontrolapp.com https://selfcontrolapp.com is also useful for blocking 9gag/Reddit/Facebook, but it will still let you get on stackoverflow I think for windows there is https://getcoldturkey.com/ https://getcoldturkey.com/