The author is Przemek Borys <pborys@dione.ids.pl>.
Besides, here are some people, who helped me by work by sending good ideas,
and helping with bugs, or helped me other way:

Linus Ĺkerlund (%)
Tomasz Kloczko (%)
Artur Frysiak (%)
Dobrica Pavlinusic (%)
Jiri Pavlovsky (%)
Pawel Wilk (%)
Paul Boekholt (*)
Ingo Oeser (*)
Simon Huggins (*)
Marius Gedminas (*)
andrew deryabin (*)
Ilya L Ovchinnikov (*)
Cort (*)
Stanislav Kuchar (*)
Kevin Kreamer (*)
David M. Cooke (*)
Liviu Daia (+)
Jarkko O Mourujarvi (+)
Michal Politowski (+)
Tim Bell (+)
Marcin Wojdyr (+)
Pawel Kot (+)
Jerzy Klejnowski (+)
Daniel Bauke
Andre' Karwath
Pawel Kolodziej
Egil Kvaleberg
Andrzej Solecki
Christian Kurz
Moritz Moeller-Herrmann
Hao Li
Sotiris Vassilopoulos
Michal Kuratczyk
Maciej Nowicki
Frederick W. Wheeler
Ryszard Kurek
Matthias Friedrich
Marcin Kadziolka
Dmitry Volosenkov
Aleksey I Zavilohin
Stanislav Kuchar
Hector Rivas Gandara
Carlo Wood
Jakub Bogusz
Michał Stępień
Jerzy Klejnowski

(there is probably sb. missing, and I can't find him -- remind me if you
see your idea working in pinfo, or if you contributed some code ;)

People marked with '%' have made really serious coding :)
People marked with '*' have sent me complete (coded) ideas/fixes.
People marked with '+' have helped by sending (almost) complete solutions.
The other people have sent bugrepots, national translations and good wish
lists.