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:
ahg@panix.com (Al Gelders), amade@diagram.fr (Paul-Bernard Amade), ascott@fws214.intel.com (Andy Scott), cook@biostat.wisc.edu (Tom Cook), csdayton@midway.uchicago.edu (Soren Dayton), dave@hellgate.utah.edu, dominik@strw.LeidenUniv.nl (Carsten Dominik), dwallach@cs.princeton.edu (Dan Wallach), dwight@toolucky.llnl.gov (Dwight Shih), edmonds@edmonds.home.cs.ubc.ca (Brian Edmonds), gviswana@cs.wisc.edu (Guhan Viswanathan), gvr@halcyon.com (George V. Reilly), hatazaki@bach.convex.com (Takao Hatazaki), hpz@ibmhpz.aug.ipp-garching.mpg.de (Hans-Peter Zehrfeld), jackr@dblues.engr.sgi.com (Jack Repenning), jamesm@bga.com (D.J. Miller II), jjm@hplb.hpl.hp.com (Jean-Jacques Moreau), jl@cse.ogi.edu (John Launchbury), jobrien@hchp.org (John O'Brien), johnw@borland.com (John Wiegley), kanze@gabi-soft.fr (James Kanze), kin@isi.com (Kin Cho), kwzh@gnu.org (Karl Heuer), lindstro@biostat.wisc.edu (Mary Lindstrom), Mark.Bordas@East.Sun.COM (Mark Bordas), meyering@comco.com (Jim Meyering), mrb@Eng.Sun.COM (Martin Buchholz), mveiga@dit.upm.es (Marcelino Veiga Tuimil), paulk@summit.esg.apertus.com (Paul Keusemann), pfister@cs.sunysb.edu (Hanspeter Pfister), phil_brooks@MENTORG.COM (Phil Brooks), pogrell@informatik.hu-berlin.de (Lutz Pogrell), pradyut@cs.uchicago.edu (Pradyut Shah), roderick@argon.org (Roderick Schertler), rxga@ulysses.att.com, sawdey@lcse.umn.edu (Aaron Sawdey), simonb@prl.philips.co.uk (Simon Blanchard), stephen@farrell.org (Stephen Farrell), sudish@MindSpring.COM (Sudish Joseph), schwab@issan.informatik.uni-dortmund.de (Andreas Schwab) terra@diku.dk (Morten Welinder), thanh@informatics.muni.cz (Han The Thanh), toma@convex.convex.com, vrenjak@sun1.racal.com (Milan Vrenjak), whicken@dragon.parasoft.com (Wendell Hicken), zapman@cc.gatech.edu (Jason Zapman II),