The editorial team extends its gratitude to all individuals and institutions who supported the development of this website, particularly:

• Professor Maciej Gołąb from the University of Wrocław for consultations and providing materials concerning Koffler's biography and works;
• Assoc. Prof. Dr. Barbara Boisits from the Austrian Centre for Digital Humanities and Cultural Heritage (Austrian Academy of Sciences) for providing access to Koffler's index;
• Ms. Tetiana Koval from the Volodymyr Vernadsky National Library of Ukraine and Ms. Olena Beregova from the Institute of Cultural Research at the National Academy of Arts of Ukraine in Kyiv for their assistance in acquiring musical scores of Józef Koffler's Symphony No. 2 and Symphony No. 4;
• Ms. Anouk Jeschke from the Musikarchiv Akademie der Künste in Berlin for her remarkably efficient assistance in acquiring digital copies of manuscript excerpts from Józef Koffler's Piano Concerto and his arrangement of the Goldberg Variations, along with the license for their online presentation;
• Ms. Maria Sołtys from Lviv and Ms. Maria Zachorowska from Kraków for providing access to family collections;
• Mr. and Mrs. Joanna and Kazimierz Świetlicki from Lviv for photographing numerous buildings;
• Mr. and Mrs. Ewa and Roman Micza from Bielsko-Biała for providing access to family collections concerning Adam Mitscha;
• Father Józef Wołczański from Kraków for the photograph and information regarding Father Stanisław Narajewski;
• Mr. Zoran Krstulović from the National and University Library in Ljubljana for his prompt responses and permission to make Józef Koffler's correspondence with Slavko Osterc from archive collections available online;
• PWM Edition and the Jagiellonian Library for permission to make Józef Koffler's correspondence with Adolf Chybiński available onlinei;
• The Archive of the University of Vienna and the Archive of Archbishop Eugeniusz Baziak in Kraków for providing numerous materials concerning Józef Koffler's biography and works;
• The International Cultural Centre in Kraków for granting permission to use a photograph by Paweł Mazur from the publication Modern Lviv (Kraków: ICC, 2020) for the homepage of the portal.

We also express our gratitude to all those who, in past decades, contributed to the preservation and popularization of Józef Koffler's legacy, including:

• Ms. Elżbieta Sternlicht, who in 2005, in collaboration with the Acte Préalable record label, made pioneering recordings of Józef Koffler's complete works for solo piano; these recordings were released as beautifully produced discs AP0122 and AP0123 Józef Koffler - Complete piano works - vol. 1 and vol. 2;
• Mr. Jan A. Jarnicki, owner of Acte Préalable, for publishing and distributing CDs (AP0122 and AP0123; 2005) featuring recordings of Józef Koffler's piano works performed by Elżbieta Sternlicht, promoting the composer's name and oeuvre;
• The organizers and performers of the concert held as part of the "Warsaw Music Encounters" festival in 2016: soloist Daniel Wnukowski, the Jerzy Semkow Polish Orchestra Sinfonia Iuventus, and conductor Krzysztof Słowiński, as well as Mr. Frank Harders-Wuthenow, producer of the album en hommage Józef Koffler (EDA 42; 2017) - we extend our sincerest gratitude for the public performance, recording, album release, and permission for the non-commercial publication of phonograms of Józef Koffler's Piano Concerto and Symphony No. 2 on this website;
• Mr. Mateusz Strzelecki, Mr. Andrzej Paweł Ślązak, and Mr. Łukasz Pawlak, owner of Requiem Records - we express our deepest gratitude for recording, releasing on CD, and granting permission for the non-commercial publication on this website of the phonogram of Józef Koffler's Capriccio op. 18, released as part of the Opus Series (2018);
• PWM Edition for including Józef Koffler's Piano Concerto in the exceptional anniversary publication100 na 100.