I used, patched and enhanced several cool Linux tools at ITTC that Doug had an influence on. e.g. DSKI (tracing) and NetSpec (network protocol testing and reporting) still have features I haven't seen in other tools.
More than anything else, working with Doug reinforced in me the possibility of working on Linux as a full-time, paid job. For that, I'm ever grateful.
 Netspec: http://www.ittc.ku.edu/~evans/talks/dren_users/dren-enhan...
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