You might want to Google e.g. Polywell, General Fusion and Tri Alpha. None of the small alternatives are probably that likely to succeed, but if one of those h

You might want to Google e.g. Polywell, General Fusion and Tri Alpha. None of the small alternatives are probably that likely to succeed, but if one of those horses reaches their target, it will change the world. (You could probably make a good argument that the chance of one of the small fusion projects to work is higher than the chance of tokamaks ever to be cost competitive with fission.)