Yes there are some free ones: https://alternativeto.net/software/rpg-maker/?feature=rpg-maker&license=free&p=2
I recommend this one: https://rpgmaker.net/games/2664/
It's the same like RPG Maker 2003 but better and not under control of RPG Maker company.
edit- Almost forgot, yes you can sell the game you made in RPG 20XX but art needs to be credit by their creators. You can replace the art and add your own if you want to.