GLEW (OpenGL Extension Wrangler Library) has been updated to version 1.5.4 with the support of OpenGL 3.3 and OpenGL 4.0 extensions.
You can download GLEW 1.5.4 HERE.
GLEW is a very useful library that does all the dirty work of checking and initializing all OpenGL extensions supported by the graphics card. I use it in some of my tools like GeeXLab or FurMark…
GLEW is the most popular OpenGL extensions management lib but there are also GLEE or Biggle that offer the same kind of functionalities.