There is an OpenGL ES 1.1 Emulator and an OpenGL ES 2.0 Emulator. Each emulator consists of a library that maps OpenGL ES API calls to OpenGL calls for that specific version. These emulators have to be supported by your desktop graphics card. There are emulators for Windows and Linux.
For information on using the OpenGL ES 1.1 Emulator, see OpenGL ES 1.1 Emulator User Guide.
For information on using the OpenGL ES 2.0 Emulator, see OpenGL ES 2.0 Emulator User Guide.