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Marune - Log your martial arts journey & connect with other athletes
Lichess - The complete chess experience, play and compete in tournaments with friends others around the world.
JabMix - Self-defense and martial arts training app
Chess.com - Play chess on Chess.
Games on GitHub - A list of popular/awesome videos games, add-ons, maps, etc.
Chessmaster - Chessmaster is a chess playing computer game series which is now owned and developed by Ubisoft.