KarlFogel uses Emacs.
He maintains these EmacsLisp libraries:
His extensive DotEmacs is here:
He also wrote the Emacs chapter of early versions of the Linux Bible for Yggdrasil GNU/Linux.
After contributing to CVS and writing the Wiki:CvsBook, he joined CollabNet to develop Wiki:SubVersion. Based on his experiences there, he wrote Producing Open Source Software: How to Run a Successful Free Software Project.
After a brief stint at Google in 2006, he decided to work full-time on copyright reform and founded QuestionCopyright.org. He has also worked for Canonical, Ltd.