Is there a free backgammon game which allows you to play against a friend even if you are on different computers (in different cities). Not hot seat where you are on the same computer.
I wouldn't mind it if it is an online game (i.e. a website vs an actual application) so long as it is for free (some games are free only against a bot but require you to "buy chips" to play against a human).
I'd need it to work on both Windows and Linux.