ReactXP is a new Library by Microsoft for building cross platform apps that run on iOS, Android, Windows, and the web. 

This comparative study of mobile app development on top of different mobile operating systems intends to help you choose a development platform to start with when you have a shoe-string budget or resource constraints.
 

Here's how to connect to a SQL server using Android and iOS, with a look at design-time, and how to set up Direct Mode for Android. 

Swift, Apple's powerful new programming language, is now open source on GitHub. Developers can submit bug fixes and enhancements, and help bring the language to new platforms. 

We use the power of Qt, the leading cross-platform framework used by over 800,000 developers, and greatly enhances it for mobile devices.