Grüztamcher
- A supplier of envelope inserting systems and polywrapping machines for direct mail. Site contains product and contact information. Located in the Netherlands.
- http://www.grutzmacher.nl

Heidelberg - Heidelberger Druckmaschinen AG
- Manufacturer of printing presses for envelopes and paper. Site includes company, product and service information. Located in Germany with links to country specific sites.
- http://www.heidelberg.com/

Halm, Inc.
- Manufacturer of a line of envelope presses, and parts. Site contains product information and company news.
- http://www.halm.com/

Curtius Trading
- Trades, purchases, installs and sells used envelope equipment worldwide. Located in Atlanta.
- http://www.curtius.com/

Chie Mei Enterprise Co., Ltd.
- Manufacturers of packaging and envelope machines. Located in Taiwan
- http://www.chiemei.com.tw/

Global Envelope Machinery
- Carries, refurbishes, and installs used envelope machinery and ancillary equipment. Site lists equipment specs and company contact information. Located in the UK.
- http://www.gemonline.biz/

F.L. Smithe
- Specializes in machine products for the envelope manufacturing industry. Site includes overview, contact, and product information. Located in New York.
- http://www.flsmithe.com/

Humbert Envelope Machinery
- Sells, installs, and offers training for envelope making machines.
- http://humbertenvelopemachinery.com