Kryoflux comes with a custom license that allows personal use only. So it is non-free as far as we are concerned. Frankly I haven't bothered reading the entire license text because the following excerpt is enough for me:

The accompanying software is free for personal use only. Commercial or other use requires a license, please contact us for a quote.

Links:
- http://www.kryoflux.com/
- https://aur.archlinux.org/packages/kryoflux