The best replacement for zen cart is oscommerce.

The best alternatives to zen cart are rated as following:
★★★★★  oscommerce
★★★★  magento
★★★  cubecart
★★  opencart
★★  prestashop
★  virtuemart
★  shopify
★  shopsite
★  woocommerce
★  cre loaded
★  x cart
  x-cart
  joomla
  cube cart
  open cart
  cs cart
  ckgold
  volusion
  creloaded
  zencart
  wp ecommerce
  ubercart
  agora
  prostores

Your alternative for zen cart is not listed? Suggest!
Speaking about zen cart, one probably shouldn't forget about google checkout.

Other search terms related to zen cart and their ratings are:
★★★★★ google checkout
You have in mind a companion for zen cart and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of zen cart in all years. Click on graph for more.
zen cart
oscommerce
magento