Usefull Links

Draughts Organizations

World Checkers Draughts Federation
American Checkers Federation
English Draughts Association
DSV NRW (German)
Czech Union of Draughts
NorthWest Draughts Federation (Irish)
North Carolina Checker Association
Scottish Draughts Association
World Draughts Federation (10x10 variant)

Independent sites

Jim Loy
Checker Maven
Online Museum

Online Games

Wyllie Only Draughts Club
Costs money but is inhabited only by world champions, grand masters and extremely friendly people. Most people use the mail play features here but it also features real time play
Featurewise clearly the best free site.
Always full of players, unfortunately most players are cheaters and bleeeep
Its your turn
Mail play style site

Assorted sites

Diagram Creator