HelpScout - Help Scout is a simple, straightforward way to provide excellent support
Sellbery - Easily automate product feeds from Shopify, Magento to Amazon, eBay and other marketplaces. Fully utilize the most profitable eCommerce channels and increase sales.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Enspire Commerce - Omni-channel ecommerce management solution
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
eBay Enterprise - eBay Enterprise provides a variety of marketing, customer care, payment processing, fulfillment, fraud detection services.