PHP/MySQL
General-purpose open-source server-side scripting language for web development.
HTML5
HTML5/CSS3 provide a new way to create web-based applications using audio, video, graphics etc.
JavaScript
Json, jQuery, Ajax are the most popular JS libraries for designing your web-site front-end.
C#
Pure object-oriented language with automatic garbage collection based on the secure .NET platform.
C++
General-purpose programming language with imperative, object-oriented and generic features.
Polymer
Cross-platform solution by Google compatible with any type of user devices and browsers.