Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Zenkit - Zenkit is the home you always wanted for your ideas, your projects, your business.
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
Webuzo - Webuzo Application Manager
HelpScout - Help Scout is a simple, straightforward way to provide excellent support
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.