The Kannel Web Configuration (KWC) tool as written by Donald Jackson is freely available for non-commercial use, and is available as donation-ware for commercial use.

What does this mean?

If you are using KWC for non-commercial use, its completely free (but you can still donate). If you are using KWC for commercial use, you should (but don’t have to) donate to the ongoing development of the product. Donator’s that wish to be listed on the sponsors page can request to do so when they make their donations.