The games of Kestrel's Hall are free and will stay free. They run on small servers that cost a few dollars a month, and anyone who wants to chip in toward the hosting can do so at - ko-fi.com/kestrelsnest. Every game stays whole either way. + ko-fi.com/kestrelsnest. Chipping in unlocks nothing, and nothing is held back without it.
Hnefatafl belongs to everyone. It is more than a thousand years old.