C++
As the first language, I learnt, it is the language I have the most experience in. Used in numerous game projects with OpenGL.

C#
Worked with the Unity3D engine for 3 years and wrote a REST-ful API to act as a high score server in ASP.NET 5 Core.

Java
Picked it up for use in Android game and app development a year ago. Not my main language but my experience in C# helps me a lot.

Python
Developed a REST-ful service using the Flask framework, hosted on Google App Engine as part of a school assignment.

GLSL
Able to implement lighting and post processing effects like toon-shading, bloom and more. It has helped me in working with Unity Shaders.

PHP
Developed a simple forum with multiple categories and threads with a login system for members and admins.