[R] Inter-rater reliability for 3 unique raters with binary outcome

[Lubo Larsson]

Hello,

I would like to know if there is an R utility for computing some
measure of inter-rater reliability/agreement for 3 raters (columns),
where each rating is a binary assessment. Further, the three raters
are unique (the same rater's assessment in any single column) so that
ideally the statistic would account for this fact.

I see there was a package "concord" that had a variety of utilities
for computing kappa stats but looks to me that it is no longer
available.