Osamuko's Japanese Mahjong Blog
Osamuko's Japanese Mahjong Blog was a leading English language blog on Japanese mahjong. Articles covered various topics on the game, such as beginner strategies, defensive techniques, and mahjong tournaments. The site was also home to its own community housed in the IRC channel: #osamuko on the irc.rizon.net server.
World Riichi Mahjong League
World Amateur Mahjong League
Centered around the site and its name, the Osamuko online community formed via IRC. As of 2015, much of the chat activity transferred over to Discord.