Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Jira Service Desk - IT service desk and customer service software by Jira Service Desk. Powerful ticketing system used by 25,000+ organizations. Try it free today.
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
Freshservice - Freshservice: the one-stop cloud solution for all your IT management needs.
HelpScout - Help Scout is a simple, straightforward way to provide excellent support
SolarWinds Service Desk - An IT service management (ITSM) solution that understands what it takes to successfully manage your employee services. Try Solarwinds Service Desk for free!