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