They are using various tools, but nothing is going to scream that they are using this or that. As someone who does 3D animation I can say it's a long process at first. You have to design or buy 3D models, sets, props, and all that to create scenes.
This gets easier over time as tons can be reused, but it's either going to cost you time or money to get there (likely both to some degree). Then you have to record or pay someone to create a song, and animate your scenes to the music. I'm basically a "one man band" in the 3D animation world and it's a daunting task to say the least.