As I work with teachers to implement game-based learning (GBL), they are always looking for any free tools that exist. While some are willing to pay for iPad game apps or using the Kinect, these tools often cost money. Luckily, there are many tools out there that are free and that teachers could use in the classroom as soon as tomorrow. Some of these tools are not only the games themselves, but also lesson plans and ideas for using the game in the classroom. Here are some of my favorite free GBL tools.