Crocotile3D alternatives?

I recently found this amazing software here which is a great tool to create tile-based 3D models. I really wanted to use it to create awesome models for my games, but then I realised that a one-time payment of $10 is required to access the save & export feature. 10 bucks to save the models? You’ve got to be kidding me. Is there another similar program I can use? I’m open to any suggestion.