Talkus - Chat with your website users from Slack
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
Keeping - Turn Gmail into a Fully Functional Helpdesk
ZenDesk - Zendesk is a beautiful, lightweight help-desk solution.
Drift for Slack - Talk to your website visitors & customers in real-time
LiveAgent - LiveAgent is a fully-featured web-based live chat and helpdesk 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 14-day trial today.