Greenhoe Trombones
- From trombonist Gary Greenhoe in Jackson, Wisconsin. Famous for the modular Greenhoe Valve and Lever Section, customizing Conn trombones, the Rest Bar, Sonic Suspension, and an invention by trombonist Ralph Sauer called The Brace.
- http://www.greenhoe.com/

S. E. Shires Co.
- Custom trombone builder. Includes a gallery of instruments and production photographs, and a dealer listing.
- http://www.seshires.com/

List of Trombone Manufacturers
- Provided by bass trombonist René Laanen in the Netherlands, the Trombone Page of the World features a comprehensive list of trombone manufacturers, technicians, and mouthpieces.
- http://www.trombone-usa.com/trombg.htm

Aniello Sessa Trombone Compatto
- The Compact Trombone was created by a trombonist from Italy in 1993. Famous for the small size and double slide. This site is written in Italian and English, and requires Macromedia Flash Player.
- http://www.aniellosessa.com/

Hagmann Free-Flow Rotary Valve
- From Rene Hagmann in Geneva, Switzerland. Famous for unique air flow path, and levers with saddle design.
- http://www.trombone.ch/

Michael Rath Trombones
- Based in Huddersfield, West Yorkshire, England and run by trombonists Michael Rath, Andrew Hutchinson, Adrian Davison, and Christopher Beaumont. Famous for the R1 model, the Hagmann valve, as well as a family of sackbuts modelled on instruments made by A
- http://www.rathtrombones.com/