Is blender free forever?

I'm curious, can you confirm if Blender is indeed free to use forever, without any hidden costs or future upgrades that might require a fee? I've heard it's an amazing tool for 3D modeling and animation, but I want to make sure there aren't any surprises in store for me if I decide to start using it for my projects. Is Blender truly a free and open-source software that can be used without limitations for personal and commercial purposes?