Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
FinancialForce HCM - FinancialForce.com provides cloud back-office applications for Salesforce CRM.
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
Vibe HCM - Vibe HCM is a recruiting and employee engagement platform.
HelpScout - Help Scout is a simple, straightforward way to provide excellent support
BMC Remedy - IT Service Management Suite