The Yarra engine was designed to be a cross platform C++ gaming engine, using OpenGL for 3D graphics and OpenAL for positional sound. Unlike existing engines, Yarra was primarily designed to allow dynamic adding of programmable objects to a scene graph with handlers to control game flow. This design doesn't suite a majority of software out there, but works great for games. But the article isn't about Yarra, it's about the developers personal experiences working with Windows, MacOSX and BeOS. The article discusses the pro's and con's of each environment, and give sa very subjective opinion about the merits of each.