Xamarin is considered to be the top cross-platform framework development integrated into Visual Studio with C# as its base and had an SDK for both IOS and Android.
Xamarin
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Archives: cross_application
cross_application news and reviews
Cordova Phonegap
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PhoneGap allows you to work with a single code base using HTML, CSS, JavaScript, Web APIs alongside jQuery Mobile, and Backbone.js, etc.
Ionic Framework
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Built on standard web technology, Ionic is an open-source framework that helps developers build beautiful and lightning fast cross-platform hybrid.
React Native
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A cross-platform mobile app development framework powered by Facebook, React Native uses the same user interface (UI) blocks as IOS and Android.