lidraughts.org

playstrategy.org has American Checkers/English draughts

It also seems to be built from the same code that lichess and lidraughts use. Maybe someone tech savvy could pull it from there and implement it here.

Some years ago lidraughts devs claimed that it is hard to implement any new variants.
However, I looked upon a code which enabled Russian and Brazilian variants, and I can assure that pure coding work for implementation of one new variant should not take more than 2 days (16 working hours). Just for illustration purposes, it would require not more than 100 lines of coding.
Of course, the addition of any new variant might require changes in the tournament schedule, but the rescheduling of events should not take more than 2 working hours.
I believe that we can even find a programmer who could do the coding part for EUR 200,00 or an equivalent, and this sum is easily collectible by donations. So far, devs were reluctant to communicate a necessity for donations in order to implement new variants who could attract more players.
Finally, let me ask you: is the inactivity of lidraughts devs justified?

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@kalnap If you find someone to code new variants I'm willing to donate to help out. I would be interested in trying new variants if they were available.

I'd also donate but I think what he's saying is it's not a problem of donations. Developers probably just mostly abandoned the site.

Is permission from the developers needed to make changes to the code or can anyone contribute?

There were some initiatives which were accepted by developers, however, as for adding new variants, their response was noncommittal.

Reconnecting