Xilinx introduced the ISE Design Suite software to enable
breakthrough optimizations for power and cost with greater design
productivity. For the first time, ISE design tools deliver intelligent
clock-gating technology that reduces dynamic power consumption by as
much as 30 percent. The new suite also provides advances in
timing-driven design preservation, AMBA 4 AXI4-complaint IP support for
plug-and-play design, and an intuitive design flow with
fourth-generation partial reconfiguration capabilities that lowers
system cost for a broad range of high performance applications.

http://www.xilinx.com/tools/designtools.htm