Wavefrom conversion

To convert fsdb dump to vcd file. 
fsdb2vcd $fsdbfile -o $vcdfile

To convert vcd file to fsdb dump
vcd2fsdb $vcdfile -o $fsdbfile

Reference
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1. http://www.edaboard.com/thread35007.html

Verilator and Dinotrace

Verilator[Ref 1] is an open-source and  free Verilog HDL simulator. Its installation is straightforward.
Ref 2 provides instructions to download and install verilator. The readme.pod file in the verilator downloaded also described the installation instructions.
Ref 3 provides examples to do simulation using verilator.

Dinotrace[Ref 4] is a free tool to look at waveforms. 

Reference
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1. http://www.veripool.org/wiki/verilator
2. http://www.veripool.org/projects/verilator/wiki/Installing
3. http://www.veripool.org/projects/verilator/wiki/Manual-verilator
4. http://www.veripool.org/wiki/dinotrace