SMF is used as a forum in nearly every type of group imaginable. Whether that be government, commercial enterprise, academic, non-profit, computing, hobby/fan clubs, or music. You name it, there is probably a Simple Machines Forum that talks about it. Also see Large forums

The following is a list of some of the notable ones:

Open Source projects

• Coppermine Photo Gallery
• 4 Image Photo Gallery
• Mibew Messenger
• Website Baker
• Roundcube Webmail

Commercial/Enterprise

• Red Hot Chili Peppers - Rock band
• Downhere - Christian Pop/Rock band
• Audiosurf - Popular Computer game
• Netenberg - Developers of the popular Fantastico Automated Script Installer
• ClassRoomM - Official forum for the book 'Programming in Objective-C'
• Comodo - Software and Internet Security Company
• avast! - Software Company that Develops Antivirus and Internet Security Software
• Pro FTPd - One of the "big" FTP server software packages
• YoYoExpert - One of the largest YoYo retailers

Government

• Isis Suport at the US Geological Survey
• Construction and Planning Agency, Ministry of the Interior - Taiwan
• Hydroacoustics Forum, Office of Surface Water, US Geological Survey