HelpScout - Help Scout is a simple, straightforward way to provide excellent support
HelpDesk - HelpDesk is a powerful and affordable ticketing system and help desk software for effortless customer support. Get started for free, no credit card required.
No Chat - Flash your screen to speak and create custom msgs to be heard in a crowd.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Crisp Chat - Multi-channel customer support software
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.