# Output: {'user': [{'username': 'john_doe'}]} # Only valid usernames
Фото: Chris Radburn / Reuters
In his spare time, Wouter made the 3D Cube Engines including Cube 2/Sauerbraten with Lee Salzman for Mac, Windows and Linux (now open-sourced with over 1,000,000 downloads). It’s a performant multiplayer, deathmatch engine (like the Quake engine) but also enables real-time, multiplayer, map editing (and this was in the year 2000 almost a decade before Minecraft would make this a core mechanic).，更多细节参见服务器推荐
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