listGLFWmonitors is a command line tool for listing available monitors to GLFW, and prints all the video modes.

On my OSX 10.10.5 macbook air I get the following result:

Number of detected monitors: 1

Monitor#0 Physical Size: 285mm. x 178mm.

Monitor#0 Supported Video Modes: 8

Mode #0: 640x480_60Hz R8G8B8

Mode #1: 720x480_60Hz R8G8B8

Mode #2: 800x500_60Hz R8G8B8

Mode #3: 800x600_60Hz R8G8B8

Mode #4: 1024x640_60Hz R8G8B8

Mode #5: 1024x768_60Hz R8G8B8

Mode #6: 1152x720_60Hz R8G8B8

Mode #7: 1280x800_60Hz R8G8B8