请看Xamarin。他们有Visual Studio的扩展(http://xamarin.com/visual-studio)。

摘自网站:

Xamarin提供了Visual Studio插件，这样你就可以在一个解决方案中开发你的iOS、Android和Windows应用程序。Xamarin扩展支持在模拟器或设备上构建、部署和调试。

您可以使用Tersus(免费、开源)。

你很快就可以使用Adobe Flash CS 5在Windows上为iPhone创建应用程序:

flashcs 5

Flashcs5应用程序的iPhone

只要做一个网页应用。 iOS网页应用包括:

Reliable. The amount of time it takes to make an update is far shorter than with XCode. Fast. JavaScript on iOS is, by nature, far faster than native apps. Free. You never have to pay Apple a cent, as Apple doesn't have any control over you. Safer. If a crash occurs with a native app, it can take down even the newest iOS devices for hours or even days, until the user can fix them. If a web app crashes, the user just has to close and reopen it, worst case scenario. Offline. You can easily create a service worker to handle your app. Secure. Because you do not have access to native APIs, a security breach will be significantly less dangerous. Easy to program. A basic iOS web app can be programmed from the Safari URL bar on an iPhone. Literally. I've done it myself.

这是一个新工具:oxygene，你可以用它来为iOS/Mac、Windows RT/8或Android开发应用。它使用派生自Object Pascal和Visual Studio的特定语言(并使用.net或java.)。它似乎真的很强大，但不是免费的。

你可以使用Java为iPhone开发应用，而Java可以连接到网络。