# Front Matter

Contents

- Front Matter
  - Acknowledgements
  - Copyright
  - DISCLAIMER OF LIABILITY

## Acknowledgements

Leo owes much of its visual design to `MORE`, possibly the most elegant computer program ever written. Leo's clone nodes are inspired by `MORE`.

The following people have made generous donations to the Leo project: Robert Low, Nic Cave-Lynch.

The following people reported bugs, answered questions, and made suggestions for improving Leo: Alex Abacus, Shakeeb Alireze, Steve Allen, Bruce Arnold, Chris Barker, Dennis Benzinger, David Boddie, Jason Breti, Eric Brown, Terry Brown, Darius Clarke, Martin Clifford, Jason Cunliffe, Josef Dalcolmo, Gil Dev, Bill Drissel, Wenshan Du, Allen Edwards, Chris Elliot, Dethe Elza, Mark Engleberg, Roger Erens, Stephen Ferg, Tom Fetherston, Tomaz Ficko, Niklas Frykholm, Fred Gansevles, Jonathan M. Gilligan, Zak Greant, Thomas Guettler, Romain Guy, Dave Hein, Tiago Castro Henriques, Gary Herron, Steve Holden, Klass Holwerda, Matthias Huening, Robert Hustead, John Jacob, Paul Jaros, Christopher P. Jobling, Eric S. Johansson, Garold Johnson, James Kerwin, Nicola Larosa, David LeBlanc, Chris Liechti, Steve Litt, Martin v. Loewis, Robert Low, Fredrik Lundh, Michael Manti, Alex Martelli, Marcus A. Martin, Gidion May, David McNab, Frank Merenda, Martin Montcrieffe, Will Munslow, Chad Netzer, Derick van Niekerk, Jeff Nowland, Naud Olivier, Joe Orr, Marc-Antoine Parent, Paul Paterson, Sean Shaleh Perry, Tim Peters, David Priest, Gary Poster, Scott Powell, Bruce Rafnel, Walter H. Rauser, Olivier Ravard, David Speed Ream, Rich Ries, Aharon Robbins, Guido van Rossum, David Rowe, Davide Salomoni, Steven Schaefer,Johannes Schöön, Wolfram Schwenzer, Casey Wong Kam Shun, Gil Shwartz, Jim Sizelove, Paul Snively, Jurjen Stellingwerff, Phil Straus, David Szent-Györgyi, Kent Tenney, Jeffrey Thompson, Gabriel Valiente, Jim Vickroy, Tony Vignaux, Tom van Vleck, Kevin Walzer, Ying-Chao Wang, Cliff Wells, Dan Wharton, John Wiegley, Wim Wijnders, Dan Winkler, Vadim Zeitlin.

The following have contributed plugins to Leo:

Rodrigo Benenson, Pierre Bidon, Felix Breuer, Terry Brown, Mike Crowe, Josef Dalcolmo, Michael Dawson, e, Roger Erens, Andrea Galimberti, Engelbert Gruber, Timo Honkasalo, Jaakko Kourula, Maxim Krikun, Zhang Le, LeoUser, Frédéric Momméja, Bernhard Mulder, Mark Ng, Alexis Gendron Paquette, Paul Paterson, Dan Rahmel, Davide Salomoni, Ed Taekema, Kent Tenney, Brian Theado, Ville M. Vainio, Steve Zatz.

The following deserve special mention: David Brock wrote TSyntaxMemo. The late Bob Fitzwater kept me focused on design. Donald Knuth invented literate programming and the CWEB language. Jonathan M. Gilligan showed how to put the Leo icon in Leo's windows. Joe Orr created XSLT stylesheets for Leo; see http://www.jserv.com/jk_orr/xml/leo.htm. Joe Orr also created an outstanding set of tutorials for Leo; see http://www.evisa.com/e/sb.htm. LeoUser (B.H.) contributed numerous plugins and was the inspiration for Leo's minibuffer. LeoUser also wrote jyLeo: Leo for Jython. Bernhard Mulder proposed a new way of untangling derived files. John K. Ousterhout created tcl/Tk. Neal Norwitz wrote PyChecker. Marc-Antoine Parent urged me to use XML for Leo's file format and helped improve it. Paul Paterson suggested the plugin architecture, suggested an approach to spell checking and has contributed many excellent plugins. François Pinard wrote pymacs. Norman Ramsey created noweb and gave permission to quote from the noweb web documentation. Rich Ries has contributed a huge number of suggestions. Steven P. Schaefer pointed out major security problems lurking in hooks. Gil Shwartz helped with unicode support. Phil Straus has been a great friend and constant support. Guido van Rossum created Python, Tkinter and the Python License. Dave Winer created `MORE`. Ville M. Vainio created ILeo. Dan Winkler helped support Leo on the Mac.

Special thanks to my family. My brother, David Speed Ream, tested Leo and made many useful suggestions. Rebecca, James and Linda make it all worthwhile. It was during a conversation with Rebecca that I realized that `MORE` could be used as a prototype for Leo. That was a crucial first step.

## Copyright

All parts of Leo are distributed under the following copyright. This is intended to be the same as the Python license, namely that Leo is absolutely free, even for commercial use, including resale. There is no GNU-like "copyleft" restriction. This license is compatible with the GPL.

Copyright 1997-2006 by Edward K. Ream. All Rights Reserved. Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appears in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the names of Edward K. Ream or Leo may not be used in advertising or publicity pertaining to distribution of the software without specific, prior written permission from Edward K. Ream.

## DISCLAIMER OF LIABILITY

EDWARD K. REAM (REAM) SPECIFICALLY DISCLAIMS ALL WARRANTIES, EXPRESSED OR IMPLIED, WITH RESPECT TO THIS COMPUTER SOFTWARE, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL REAM BE LIABLE FOR ANY LOSS OF PROFIT OR ANY COMMERCIAL DAMAGE, INCLUDING BUT NOT LIMITED TO SPECIAL, INCIDENTAL, CONSEQUENTIAL OR OTHER DAMAGES.