There is support for full OpenGL 2.1, including the imaging subset, plus some extensions:

 extension                      | core since
 -------------------------------+------------
 GL_APPLE_packed_pixels         | 1.2
 GL_ARB_depth_texture           | 1.4
 GL_ARB_imaging                 |
 GL_ARB_multisample             | 1.3
 GL_ARB_multitexture            | 1.3
 GL_ARB_occlusion_query         | 1.5
 GL_ARB_point_parameters        | 1.4
 GL_ARB_point_sprite            |
 GL_ARB_shadow                  | 1.4
 GL_ARB_texture_border_clamp    | 1.3
 GL_ARB_texture_compression     | 1.3
 GL_ARB_texture_cube_map        | 1.3
 GL_ARB_texture_env_add         | 1.3
 GL_ARB_texture_env_combine     | 1.3
 GL_ARB_texture_env_crossbar    | 1.4
 GL_ARB_texture_env_dot3        | 1.3
 GL_ARB_texture_mirrored_repeat | 1.4
 GL_ARB_transpose_matrix        | 1.3
 GL_ARB_vertex_buffer_object    | 1.5
 GL_ARB_window_pos              | 1.4
 GL_EXT_abgr                    |
 GL_EXT_bgra                    | 1.2
 GL_EXT_blend_color             | 1.4
 GL_EXT_blend_func_separate     | 1.4
 GL_EXT_blend_logic_op          | 1.1
 GL_EXT_blend_minmax            | 1.4
 GL_EXT_blend_subtract          | 1.4
 GL_EXT_color_subtable          |
 GL_EXT_compiled_vertex_array   |
 GL_EXT_convolution             |
 GL_EXT_copy_texture            | 1.1
 GL_EXT_depth_bounds_test       |
 GL_EXT_draw_range_elements     | 1.2
 GL_EXT_fog_coord               | 1.4
 GL_EXT_histogram               |
 GL_EXT_multi_draw_arrays       | 1.4
 GL_EXT_packed_pixels           | 1.2
 GL_EXT_polygon_offset          | 1.1
 GL_EXT_rescale_normal          | 1.2
 GL_EXT_secondary_color         | 1.4
 GL_EXT_separate_specular_color | 1.2
 GL_EXT_shadow_funcs            | 1.5
 GL_EXT_stencil_two_side        |
 GL_EXT_stencil_wrap            | 1.4
 GL_EXT_subtexture              | 1.1
 GL_EXT_texture                 | 1.1
 GL_EXT_texture3D               | 1.2
 GL_EXT_texture_lod_bias        | 1.4
 GL_EXT_texture_object          | 1.1
 GL_EXT_vertex_array            | 1.1
 GL_HP_convolution_border_modes |
 GL_IBM_rasterpos_clip          |
 GL_NV_blend_square             | 1.4
 GL_NV_depth_clamp              |
 GL_NV_fog_distance             |
 GL_NV_light_max_exponent       |
 GL_NV_packed_depth_stencil     |
 GL_NV_primitive_restart        |
 GL_SGIS_generate_mipmap        | 1.4
 GL_SGIS_texture_edge_clamp     |
 GL_SGIS_texture_lod            |
 GL_SGI_color_matrix            |
 GL_SGI_color_table             |
 

The documentation is loosely based on the man pages of the OpenGL Sample Implemenation from SGI, see: http://oss.sgi.com/projects/ogl-sample/. It is used under the SGI Free Software License B. This license requires the following notice:

License Applicability. Except to the extent portions of this file are made subject to an alternative license as permitted in the SGI Free Software License B, Version 1.1 (the "License"), the contents of this file are subject only to the provisions of the License. You may not use this file except in compliance with the License. You may obtain a copy of the License at Silicon Graphics, Inc., attn: Legal Services, 1600 Amphitheatre Parkway, Mountain View, CA 94043-1351, or at: http://oss.sgi.com/projects/FreeB/.

Note that, as provided in the License, the Software is distributed on an "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT.

Original Code. The Original Code is: OpenGL Sample Implementation, Version 1.2.1, released January 26, 2000, developed by Silicon Graphics, Inc. The Original Code is Copyright (c) 1991-2002 Silicon Graphics, Inc. Copyright in any portions created by third parties is as indicated elsewhere herein. All Rights Reserved.