Kyle R. Burton <?>                                                    the first author for gperiodic-1.x.x (1999-2002)
Jonas Frantz <jonas@frantz.fi>                                        the second author for gperiodic-2.x.x (2003-2007), Swedish translation
Alexey Loginov <loginov.alex.valer@gmail.com>                         the third author for gperiodic-3.x.x (2014), Russian translation

Piotr Najman <?>                                                      Polish translation, patches
Arno W. Peters <a.w.peters@ieee.org>                                  added in gettext support, and other source changes
Georges Khaznadar <?>                                                 French translation and related code
Mauricio Rivera <?>                                                   Spanish translation
Lalo Martins <?>                                                      Portuguese translation
Sven Neumann <?>                                                      German translation
Christian Klein <?>                                                   German translation
Koen Kooi <?>                                                         Dutch translation
Ambrogio Oliva <?>                                                    Italian translation
Felix Natter <?>                                                      patches
Michael Shigorin <mike@altlinux.org>                                  Russian translation and patches
Costantino Ceoldo <?>                                                 New data and code for the table
Arkadiusz Lipiec <?>                                                  Polish translation and patches
Sebastien Bacher <seb128@debian.org>                                  French translation, manual page, patches
Daniel Leidert <daniel.leidert@wgdd.de>                               patches
Theppitak Karoonboonyanan <thep@linux.thai.net>                       patches
Zach Ploskey <zploskey@gmail.com>                                     patches from his fork of gperiodic
Jon Abbott <?>                                                        provided updates to the table
Andrew Dalke <?>                                                      corrected errors in the table
Gunner Poulsen <?>                                                    Danish translation
Gonzalo Regueiro Iglesias <gonzalo.regueiro.iglesias@gmail.com>       Galician translation
Leandro Regueiro <leandro.regueiro@gmail.com>                         Galician translation
Andrea Tasso <andrea@tasso.info>                                      Italian translation
Osman Köşeli <?>                                                      Turkish translation
Frederic Gobry <?>                                                    patches
Ireneusz Imiolek <imiolek.i@googlemail.com>                           Polish translation
Oleksandr Mishchenko <sasha.mishchenko@gmail.com>                     Ukrainian translation
Juan Rafael Fernández                                                 Spanish translation
Fırat Kutlu <firatkutlu@gmail.com>                                    Turkish translation
Pavel Fric <pavelfric@seznam.cz>                                      Czech translation
Yves Brungard <yves.brungard_mageia@gadz.org>                         French translation
Marcio Padula <padula1000@gmail.com>                                  Brazilian Portuguese translation
Uladyslau Ahromenka <ahromenka@gmail.com>                             Belarusian translation
Rémi Verschelde <akien@mageia.org>                                    Danish translation
André-Marie Desmottes <lebarhon@free.fr>                              French translation
Marc Lattemann <marc.lattemann@web.de>                                German translation
Michael Eklund <willard@null.net>                                     Swedish translation