很多特定的移动平台提供了免费的SDK，包括可运行在PC桌面上的设备模拟程序。
Many specific mobile platforms have free SDKs available that include device emulators that run on a PC desktop.
免费应用和单纯的依赖应用商店销售收入让位给广告型，售卖型应用和移动商用应用。
Free branded apps and a reliance on purely app store sales give way to advertising, in-application purchasing, and mobile commerce.
Opera Mini：提供免费的移动浏览器。
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