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

Radial - Radial offers order management and store fulfillment solutions.