→AMD Catalyst/fglrx: link-rot
The developers also have a frequently updated list of 3D applications which they use to mark their progress: http://www.x.org/wiki/RadeonProgram
ATI Catalyst/fglrx = ATI also offers a proprietary driver for RadeonHD chips based off of their Windows code (a legacy proprietary driver is offered for older cards, but it will not run on modern kernels/X servers)
* OpenGL 3.3/4.1 and GLSL(dependent on the latest version your card supports)
* XvBA video decode acceleration (through VA-API and only for RadeonHD 4x00 cards and later): http://www.splitted-desktop.com/~gbeauchesne/
* Direct2D acceleration
* Catalyst Control Center
= EyeFinity =
Catalyst supports more than two simultaneous outputs on RadeonHD5xxx cards having more than two physical independent out. Default settings starts every monitors in a cloned stage, but you can switch to a multiple display desktop via the Catalyst Control Center. Be aware that the
ATI Catalyst Control Center does not let you fix arbitrary position settings : it only lets you approximately place your monitors on a virtual desktop. It's often best to adjust screen alignment using the "Position +x +y" option in xorg.conf.'''
Open source drivers also support Eyefinity.