Gitify - GitHub Notifications on your desktop.
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
GitPigeon - GitHub notifications delivered to your Mac
LiveAgent - LiveAgent is a fully-featured web-based live chat and help desk software. It harnesses the power of a universal inbox, real-time live chat, built-in call center, and a robust customer service portal. Start your free 1 month trial today!
Octobox - Untangle your GitHub Notifications
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.