Acknowledgments

The author gratefully acknowledges Drs. Stan and Rosemarie Swanson for assistance above and beyond the call of duty.

Funding for the development of spock was provided by a National Institutes of Health traineeship for JAC.

Small portions of spock are based on existing library source code from a variety of sources, some public domain, and some copyrighted but freely distributed. The use of these routines is gratefully acknowledged by the author.

• Three dimensional contouring routines were initially taken from isovis, Public Domain, Mike Krogh, NCSA, Feb. 2, 1990, but have been heavily re-written. The terms of use of isovis request (but do not require) that we state that portions of spock were written at the National Center for Supercomputing Applications (NCSA).
• The conferencing facility for spock is built atop the simple sockets library, written by Charles E. Campbell, Jr. PhD., and Terry McRoberts. The Simple Sockets Library, developed at NASA's Goddard Space Flight Center by the U.S. Government, is public domain, and therefore may be copied and distributed freely.
• This image export capability for spock was provided in part by the FBM graphics library, Copyright 1990 by Michael Mauldin. Used by permission. FBM also uses the following two libraries
• The JPEG graphics library, copyright (C) 1991, 1992, Thomas G. Lane. Used by permission. This software provided spock's JPEG export capability. As required in the JPEG terms of use, we acknowledge that ``this software is based in part on the work of the Independent JPEG Group''. This library is no longer used by spock, since the lossy compression of JPEG images is not useful for molecular graphics.
• TIFF graphics library, Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994 Sam Leffler and Copyright (c) 1991, 1992, 1993, 1994 Silicon Graphics, Inc. Used by permission. This software provides spock's TIFF export capability.
• Conference mode file transfer error checking provided by: cksum -- calculate file checksums and sizes (version 0.9.1) A POSIX (P1003,2/D11.2, 4.9) conformed utility written by Q. Frank Xia. (C) Copyright Q. Frank Xia, Oct. 1992. All rights reserved. Used by permission. Permission to use and redistribute this software is hereby granted provided that the following conditions are met: 1. Source code redistribution must retain this statement. 2. Binary redistribution must reproduce this statement in the documentation provided with the distribution. 3. This software is provided by author Q. Frank Xia "as is". There are absolutely no warranties at all. The author is not responsible for any possible damages caused by using this software.
• GNUPLOT, Copyright (C) 1986 - 1993 Thomas Williams, Colin Kelley. Used by permission. The text-only mode emacs-like line editing (readline), and portions of the command-line calculator were taken from this source. GNUPLOT also provided inspiration for the command line parser.

Notice: spock's support of amber, dssp, raster3d, Molscript, and other external programs, nor the usage of grasp-style and rasmol-style commands is not meant to imply endorsement of spock by the authors or copyright holders of those programs. Spock is in no way affiliated with the authors of any of the aforementioned software. None of the source code for spock was taken from or based on source from those programs.