• Hauptwerk Virtual Pipe Organ (MDA)
• Official Hauptwerk Forum (MDA)
• Dutch Hauptwerk Forum
• MPS Orgelseite (German)
• VPO-Forum (German)

• ah Virtual Pipe Organs (offline)
• Akkerogels
• Al Morse (offline)
• Andrea Bonzi
• Appleton Audio
• Association des amis de l’orgue de Pibrac
• Audio Anglorum
• Augustine’s Virtual Organs
• Barritt Audio
• Binauralpipes
• Bovenschen Virtual Organs
• Carlos James Lara (offline)
• Christian Datzko
• CLR Resources (merged with Evensong)
• Coral Pipes
• Countre Organs
• De Hauptwerk Consultant (offline)
• Dirk’s Organ Page
• Etcetera Pipe Organs
• Evensong
• Exemplum Organum (offline)
• Forestpipes
• Hauptwerk NL (offline)
• Hauptwerk.pl (offline)
• Inspired Acoustics
• Jean Yves Garet (offline)
• JePSI Harmoniums
• Jeux d’orgues
• KeyMedia Productions (offline)
• Lavender Audio
• Les Deutsch
• Legro Virtual Organ Sample Sets
• Llannerch Virtual Organs
• Maltese Historic Pipe Organs
• Mark Beverly (offline)
• Martin den Boer
• Martin Dyde (parked for now)
• Melotone Sound Productions
• MIDI Pipe Organ
• Milan Digital Audio
• OdfGrandOrgue
• Organa Regina Caeli
• OrganArt Media
• OrganExpressions
• Organo Graziadio Antegnat (offline)
• Paramount Organ Works™
• Paul Delferriere (offline)
• PCorgan.com
• Pere Casulleras
• Piotr Grabowski
• PROSPECTUM
• Silver Octopus Studio
• Soni Musicae
• Somiere Maestro
• Sygsoft
• Virtual Organs NL (offline)
• Virtual Pipes
• Virtualaj Pipoj (offline)
• VOXUS Virtual Organs
• Zion Organs (offline)

If I have inadvertently omitted or misspelled anyone’s name, I sincerely apologize. Please feel free to contact me, and I will promptly update this list accordingly.