I have put together a list of all of the eCommerce systems that I know of. I hope they can be of some help to you all:
This list dates from 2002. There is an updated version here:
eCommerce Software / Systems
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Browser-Based Storefront Creation Services[LIST]
[]Shopify - http://www.shopify.com
[]Big Cartel - http://www.bigcartel.com
[]Nascent Commerce - http://www.nascentcommerce.com
[]Yahoo! Stores - http://store.yahoo.com
[]PayPal - http://www.paypal.com
[]BizLand - http://www.bizland.com
[]Mercantec SoftCart - http://www.mercantec.com
[]MerchandiZer (HipHip Software) - http://www.merchandizer.com
[]ShopSite - http://www.shopsite.com
[]Big Step.com - http://www.bigstep.com
[]HyperMart - http://www.hypermart.com
[]Miva Merchant - http://www.miva.com
[]Monster Commerce - http://www.monstercommerce.com
[]Shopping Q - http://www.shoppingq.com
[]Actinic - http://www.actinic.com
[]Mals E-Commerce - http://www.mals-e.com
[]ClickCartPro - http://www.clickcartpro.com
[]FlashECom Cart (hosted solution) - http://www.flashecom.com
[]SWREG - http://www.swreg.com
[]Nexternal - http://www.nexternal.com
[]CubeCart - http://www.cubecart.com/site/home/[/LIST][SIZE=3][B]FREE Browser-Based Storefront Creation Services[/B][/SIZE][LIST]
[]FreeMerchant - http://www.freemerchant.com[/LIST]Shopping Cart Solutions[LIST]
[]JShop - http://www.jshop.co.uk/
[]Cart32 - http://www.cart32.com
[]CartIt - http://www.cartit.com
[]EasyCart - http://www.easycart.com
[]PDG Shopping Cart - http://www.pdgsoft.com
[]QuikStore - http://www.quikstore.com
[]smc WebStore - http://www.smctechnologies.com
[]Midi Cart - http://www.midicart.com
[]Dansie Shopping Cart - http://www.dansie.net/cart.html
[]Sales Cart - http://www.salescart.com
[]Retail Cart - http://www.retailcart.com
[]X-Cart - http://www.x-cart.com
[]EDatCat - http://www.edatcat.com
[]VP*ASP - http://www.vpasp.com
[]Bazaar Builder = http://www.bazaarbuilder.com
[]XMart eCommerce = http://www.digitalplacebo.com
[]Ecommerce Templates - http://www.ecommercetemplates.com
[]ASPX Shop - http://www.aspxshop.com
[]ASP DotNet Storefront - http://www.aspdotnetstorefront.com/
[]Avactis - http://www.avactis.com/
[]DigiShop - http://digishop.sumeffect.com/
[]PHPCart - http://www.phpcart.net[/LIST]FREE Shopping Cart Solutions[LIST]
[]PHPCart - http://www.phpcart.com
[]OS Commerce - http://www.oscommerce.com
[]PHP Shop - http://www.phpshop.org
[]Agora Cart - http://www.agoracart.com
[]AFCommerce - http://www.afcommerce.com
[]ZenCart - http://www.zencart.com[/LIST]Advanced eCommerce Systems[LIST]
[]Interchange - http://www.icdevgroup.org
[]Broadspire Small Business Web Stores - http://www.smallbusinesswebstores.com/
[]MarketLive - http://www.marketlive.com
[]Blue Martini Software’s Customer Interaction System - http://www.bluemartini.com
[]IBM WebSphere Commerce Suite - http://www.ibm.com/websphere
[]Intershop Communications’ Enfinity - http://www.intershop.com
[]Microsoft Commerce Server - http://www.microsoft.com
[]ICN Software’s AceFlex B2C - http://www.icnsoftware.com
[]INetStore - http://www.inetstore.com
[]MerchantSpace - http://www.merchantspace.com[/LIST]