Viper, formerly known as VIP-19, was written by Michael Kifer. Viper is based on the original VIP package by Masahiko Sato and on its enhancement, VIP 4.4, by Aamod Sane. This manual is an adaptation of the manual for VIP 4.4, which, in turn, was based on Sato's manual for VIP 3.5.
Many contributors on the net pointed out bugs and suggested a number of useful features. Here is a (hopefully) complete list of contributors:
jjm@hplb.hpl.hp.com (Jean-Jacques Moreau), jl@cse.ogi.edu (John Launchbury), rxga@ulysses.att.com, jamesm@bga.com (D.J. Miller II), ascott@fws214.intel.com (Andy Scott), toma@convex.convex.com, gvr@cs.brown.edu, dave@hellgate.utah.edu, cook@biostat.wisc.edu (Tom Cook), lindstro@biostat.wisc.edu (Mary Lindstrom), edmonds@edmonds.home.cs.ubc.ca (Brian Edmonds), mveiga@dit.upm.es (Marcelino Veiga Tuimil), dwight@toolucky.llnl.gov (Dwight Shih), phil_brooks@MENTORG.COM (Phil Brooks), kin@isi.com (Kin Cho), ahg@panix.com (Al Gelders), dwallach@cs.princeton.edu (Dan Wallach), hpz@ibmhpz.aug.ipp-garching.mpg.de (Hans-Peter Zehrfeld), simonb@prl.philips.co.uk (Simon Blanchard), Mark.Bordas@East.Sun.COM (Mark Bordas), gviswana@cs.wisc.edu (Guhan Viswanathan), meyering@comco.com (Jim Meyering), pfister@cs.sunysb.edu (Hanspeter Pfister), amade@diagram.fr (Paul-Bernard Amade), jackr@dblues.engr.sgi.com (Jack Repenning), pogrell@informatik.hu-berlin.de (Lutz Pogrell), csdayton@midway.uchicago.edu (Soren Dayton), pradyut@cs.uchicago.edu (Pradyut Shah)