Heckel Bassoon, Heckel Contrabassoon, Heckel CREST Bassoon and Heckelphone Serial Numbers
- Contains numeric listings often with ownership history and photographs. Also includes other related historic information.
- http://www.heckelbassoons.info/

Schreiber and Keilwerth
- Located in Germany. Site includes instrument selection, history, and dealer list.
- http://www.schreiber-keilwerth.com/

Püchner Woodwind Instruments
- Based in Nauheim, Germany. Site includes historical background, news, maintenance instructions, product information, and photographs.
- http://www.puchner.com/en/

Heckel
- Located in Wiesbaden, Germany. Site includes product and service information.
- http://www.heckel.de/en/

Bernd Moosman Bassoon Maker
- Based in Germany. Site includes construction methods and contact information.
- http://www.b-moosmann.de/e/

Fox Products
- Based in Indiana, U.S. Site contains information about both currently-manufactured and discontinued products.
- http://www.foxproducts.com/