Platform/Requirements: Browser based
Free online membership is available with certain restrictions.
Review: This Risk game is played inside a browser. The player needs to select the moves from a number of combo boxes and buttons. Turn times are typically 18 to 24 hours. However, if you have played at least once, you can also join games that have a 15 minutes turn time. As well as standard sequential turn, it also supports simultaneous play. Multiple languages are available. The game is free to play. You can get extra features with yearly paid subscription.
P.S. Thanks to Bryan Brunton for resolving technical issues I had during my review of the web site.