Both open carry and concealed carry are legal without a permit in Vermont, which is the model for how States should behave in reverence to the Constitution and Bill of Rights.
On April 3rd, Florida became the 26th state that allows concealed carry without a permit[0]. This means over half the states now allow concealed carry without a permit. And it's likely that Nebraska will also pass constitutional carry [1] (ie concealed carry without a permit) this year becoming the 27th state.