www.zyxware.com is the website of Zyxware Technologies, one of the largest and oldest Drupal companies based out of India. The site was originally built in D5 which was then migrated to D6. The site is very content rich and gets a lot of traffic (Ranked ~16k in India and ~75k globally in Alexa). The site has several marketing features including custom landing pages, custom advertising systems, custom tracking of site funnels using GA variables and events, custom tracking of article effectiveness in driving traffic.
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