Xamarin is used to build mobile apps, but is based on C#. an existing web-based programming language. Xamarin allows devs to share code across iOS and Android and was bought by Microsoft in 2016.
Rapid development of highly scalable applications is enabled through this awesome programming language, designed for that exact purpose.
The native language of the most used mobile platform, Apple's iOS, a key component of any mobile targeted project.
The most popular and well established enterprise development language gained further significance as it also the basis for developing Android apps.
In all their glory, SQL Server, Oracle and MySQL are the long established go-to databases behind the majority of enterprise applications.
HTML5 and CSS3
HTML5 is powering the next generation web experience, both on desktop computer and mobile devices.