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.
ZhEng Company Inc.: Offers optimizing services, manual submissions, and marketing.
zoom group: Optimizing, automated submissions, and reporting. Based in Hertford, United Kingdom.
zTrenz Solutions: Providing search engine optimization, internet marketing, and link building.
Zunch Communications Inc: Search engine optimization, marketing, positioning, submission and ranking services company.