GTKWave is a wave viewer for Verilog simulation.

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http://linuxlandit.blogspot.com – GTKWave is a fully featured GTK+ based waveform viewer which reads FST, LXT, LXT2, VZT, and GHW files as well as standard Verilog VCD/EVCD files and allows their viewing. GTKWave is developed for Linux, with ports for various other operating systems including Microsoft Windows (either natively as a Win32 application or via Cygwin), and Mac OS X targeting either X11 or Quartz. GTKWave is one of the applications affiliated with the open-source gEDA Project. Because GTKWave is designed to handle many signals at once, it has three signal searching modes (Regular Expressions, Hierarchy, and Tree) (HowTos)