Free42 is (C) 2004-2010 by Thomas Okken, except:

Decimal math: BCD20 library by Hugh Steers.
INTEG: Romberg integration implementation based on code by Hugh Steers.
LU Decomposition and back-substitution code, and Ridders' root-refinement
   algorithm, based on sample code from "Numerical Recipes in C".
Binary implementations of floating-point math routines, used in all binary
   builds, developed at SunPro, a Sun Microsystems business.
Skins designed by, or based on original work of: Christoph Giesselink,
   Curtis Cameron, Denis Cesar, Egan Ford, Erik Ehrling, Guenny, Jeff O.,
   Jerrod Hofferth, Keith Carangelo, Klaus Reckermann, Michael Khor,
   Michael Vogel, Miguel Toro, Noe Ramos, Sebastien Carlier, Sven from Vienna,
   and Thomas Lienhard,

MacOS X Dashboard version by D. Jeff Dionne.
iPhone version by Byron Foster; pop-up keyboard code by Susan Mackay.

Testing: Vini Matangrano, Dave Johnson, Walter Bonin, Andres Rodriguez,
   Jeff O., Miguel Toro, Les Wright, and many others.

Free42 has benefited tremendously from, and probably wouldn't even exist today
if it weren't for, these excellent pieces of Free Software: PRC-Tools by
D. Jeff Dionne, with multi-segment debugging support by Ton van Overbeek; Peal
by Greg Parker; Vim by Bram Moolenaar; DDD by Dorothea Luetkehaus and Andreas
Zeller; NetPBM by Jef Poskanzer and others; gcc/g++ by Richard Stallman and
others; gdb, binutils, and too many other fine tools to name, by the Free
Software Foundation and its contributors; and the Linux kernel by Linus
Torvalds and others.

Many thanks to all concerned for the help and advice I received from many
contributors to several Usenet newsgroups and various mailing lists.

And of course, kudos to the inspiration for it all, the excellent HP-42S
calculator by Hewlett-Packard.

A big and continuing Thank You to all the many people whose names I did not
record, who have sent me bug reports, words of encouragement, and donations.