Freshservice - Freshservice: the one-stop cloud solution for all your IT management needs.
Vtiger Help Desk - Vtiger Help Desk provides multi-channel helpdesk 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
Hubspot Service Hub - HubSpot's customer service software makes supporting customers easy. Help your customers on the channels they prefer, while driving efficiency for your team.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Zendesk Suite - The complete Zendesk suite in one package