Meteor, Butterfly and a blade (originally called 流星蝴蝶劍.net, AKA: Meteor Blade, 流星·蝴蝶·劍, Meteor, Butterfly, Sword, Liuxing Hudie Jian) is an action role-playing 3D game adapted from the famous martial arts novel of the same name by Gu Long from China, developed and released by 昱泉國際 (InterServ International) from Taiwan in China in 2002. It is the world's first martial arts-style 3D fighting online battle game.

Ragdoll Masters is a task-type small 2D fighting game with very high playability, developed by Matteo Guarnieri from Italy. It uses the ragdoll physics, and features some of the most sophisticated physics ever used in 2D games and plenty of other neat effects. There is no complicated way to play it, and all player has to do is rely on inertia to hit the enemy's vital parts with the player's fists and feet.

Krav Maga (קרב מגע‎, pronounced as [krɑ:v, mə'ɡɑ:], means "contact combat", AKA: Israeli Combat System) is a military unarmed combat/self-defense system originating in Israel, and originally specially developed for the Israel Defense Forces (IDF) and Israeli Security Forces (Shin Bet and Mossad), its originator is Imi Lichtenfeld (AKA: Sde-Or). It is a required course for the Israel Defense Forces and all personnels work on military and law-enforcing departments. Now, in addition to being widely imparted to various law enforcement officers around the world, it also has become a very popular and efficient self-defense art for civil use.