MiGLayout is free to use for commercial and non-commercial projects and the source code is provided. 
It is licensed under the very free BSD or GPL license, whichever you prefer. We would be glad if you told us about where it is used though and testimonials are especially appreciated. Please spread the word if you like MiGLayout! Likewise we welcome bug reports and feedback at our forums under the MiG Layout section. It will lead to improvements, we promise. As with all MiG Products we have a Zero Bugs Policy!