Dinotrace is a X-11 waveform viewer which understands Verilog Value Change Dumps, ASCII, and other trace formats. It allows placing cursors, highlighting signals, searching, printing, and other capabilities superior to may commercial waveform viewers.
Dinotrace comes with a interface to GNU Emacs-21 which allows source code and log files to be annotated with the values of signals.
Dinotrace is optimized for rapid debugging. With &VTRACE;, a simulation failure will automatically place cursors where errors occur, add comments visible in the wave form viewer. Four mouse clicks and the errors will be highlighted in the log files, and the values of signals at the error will be seen in the source.