NVIDIA has released OpenGL 4.4 Preview driver for Linux

Supported GPUs:

Quadro Series:K600, K5000, K4000, K2000D, K2000, 6000, 600, 5000, 410, 4000, 400, 2000D, 2000
GeForce 700 Series:GTX TITAN, GTX 780, GTX 770, GTX 760
GeForce 600 Series:GTX 690, GTX 680, GTX 670, GT 645, GT 640, GT 630, GT 620, GT 610, 605
GeForce 500 Series:GTX 590, GTX 580, GTX 570, GTX 560 Ti, GTX 560 SE, GTX 560, GTX 555, GTX 550 Ti, GT 545, GT 530, GT 520, 510
GeForce 400 Series:GTX 480, GTX 470, GTX 465, GTX 460 v2, GTX 460 SE v2, GTX 460 SE, GTX 460, GTS 450, GT 440, GT 430, GT 420, 405

Extensions specific to hardware:

For OpenGL 4 capable hardware:

ARB_buffer_storage
ARB_clear_texture
ARB_query_buffer_object

For OpenGL 3 capable hardware:

ARB_enhanced_layouts
ARB_multi_bind
ARB_texture_mirror_clamp_to_edge
ARB_texture_stencil8
ARB_vertex_type_10f_11f_11f_rev

These new ARB extensions are provided:

For GeForce 6xx and above capable hardware:

ARB_bindless_texture
ARB_seamless_cubemap_per_texture

For OpenGL 4 capable hardware:

ARB_compute_variable_group_size
ARB_indirect_parameters
ARB_shader_draw_parameters
ARB_shader_group_vote
ARB_sparse_texture

These new NV extensions are provided:

NV_blend_equation_advanced
NV_bindless_multi_draw_indirect
NV_gpu_program5_mem_extended

Download for 32-Bit
Download for 64-Bit