Modern shader-based versions of OpenGL are very similar to:

• OpenGL ES 2 (a somewhat subsetted version of OpenGL that runs in portable devices such as Android and Apple iOS platforms), and
• WebGL (the version of OpenGL that runs inside web browsers). WebGL programs are written in JavaScript. As of Fall 2018, WebGL only supports GLSL #version 100. This version has only vertex and fragment shaders, uses "attribute" instead of "in" to declare per-vertex attributes, and uses "varying" instead of "out" to declare variables passed to the fragment shader. Several other significant language limitations exist as well.
• JOGL 2 (a Java binding to the OpenGL API that can run standalone in desktop applications and/or can be launched from browsers via the Java Web Start mechanism using jnlp links).

Click on the image on the left for a brief summary of the evolution of and relationships between the various versions of OpenGL.