Zann Marketing Pty Ltd.
- An Australian-owned company involved in internet marketing, in particular affiliate marketing and web publishing. Includes Tutorials for webmasters and web developers.
- http://www.zann-marketing.com/

zTrenz Solutions
- Providing search engine optimization, internet marketing, and link building.
- http://www.ztrenz.com

Zunch Communications Inc
- Search engine optimization, marketing, positioning, submission and ranking services company.
- http://seo.zunch.com/

zoom group
- Optimizing, automated submissions, and reporting. Based in Hertford, United Kingdom.
- http://www.zoomgroup.co.uk/