installedNvidia/Mesa

$ pacman -Qs nvidia
local/bumblebee 3.2.1-5
    NVIDIA Optimus support for Linux through VirtualGL
local/lib32-nvidia-utils 343.22-1
    NVIDIA drivers utilities (32-bit)
local/libcl 1.1-4
    OpenCL library and ICD loader from NVIDIA
local/libvdpau 0.8-1
    Nvidia VDPAU library
local/nvidia 343.22-2
    NVIDIA drivers for linux
local/nvidia-utils 343.22-1
    NVIDIA drivers utilities
$ pacman -Qs mesa
local/glu 9.0.0-3
    Mesa OpenGL Utility library
local/lib32-libtxc_dxtn 1.0.1-5
    S3 Texture Compression (S3TC) library for Mesa (32-bit)
local/lib32-mesa 10.3.1-1
    an open-source implementation of the OpenGL specification (32-bit)
local/lib32-mesa-dri 10.3.1-1
    Mesa DRI drivers (32-bit)
local/lib32-mesa-libgl 10.3.1-1
    Mesa 3-D graphics library (32-bit)
local/lib32-mesa-vdpau 10.3.1-1
    Mesa VDPAU drivers (32-bit)
local/libtxc_dxtn 1.0.1-5
    S3 Texture Compression (S3TC) library for Mesa
local/mesa 10.3.1-1
    an open-source implementation of the OpenGL specification
local/mesa-demos 8.2.0-3
    Mesa demos and tools
local/mesa-dri 10.3.1-1
    Mesa DRI drivers
local/mesa-libgl 10.3.1-1
    Mesa 3-D graphics library
local/mesa-vdpau 10.3.1-1
    Mesa VDPAU drivers
$