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
Issuetrak - Issue tracking software for help desk and customer service
UseResponse - Open-source, self-hosted customer feedback software, live chat and helpdesk system that you can install on your server. Organize documentation using knowledge base and get feedback from social networks with centralized system
AzureDesk - Azuredesk.co is an online customer service software and support ticket help desk application for small business and fast-growing companies. Get a free trial today!
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Vision Helpdesk - Help Desk Software, Multi-Company Help Desk, ITSM Service Desk & Live Chat Software