Lux by Sillysoft is very well done, online or only on your machine. It's not free, but I bought it so many years ago and it's been totally worth it. http://sillysoft.net
There are also many many maps and computer AI players you can download. Good stuff.
i have registered and created a game... not playing yet.. i wonder if i have to wait for the invitee to reply...?
yes a quick review of the rules and it appears this may take a while to get going...
download the gameranger client from www.gameranger.com it will support risk II
now you will obviously need risk II it's quite cheap but i am sure you can get around that . risk II is an old version but runs on power PC macs. Intel mac users should not have problem running it using rosetta.
at the moment there are no many players online so when you sign up in gameranger you might not find anyone there so tell your friend or use this and other forums to let mac users know that they can use gameranger services. i too need people to play with so come over