Hi Sreejith
As Ranjith sir said, Fedora Electronics Lab is the way to go. The
following is how the pieces will look like inside FEL
OS : Fedora 8
VHDL simulator : GHDL
Verilog simulator : Icarus Verilog
Waveform display (for both) : Gtkwave
Verilog synthesis : Icarus Verilog (for Xilinx target)
Verilog/VHDL synthesis : Xilinx ISE Webpack (for Xilinx target)
I have used all the above and they are well supported by the
community. There is also no limitation in doing large designs. Xilinx
tools will be supported by the company itself and also by an active
user community.
Regards
David