Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Lempod - lempod is the original LinkedIn pod software and the largest marketplace of LinkedIn Engagement Pods where LinkedIn Content makers on the same pod automatically engage with your content so you get 10, 20 or 30 times more post reach and views.
Kayako - Help Desk Software and Customer Service Software by Kayako. Improve customer satisfaction, increase sales.
Influx - Customer support as a service
MeisterTask for Freshdesk - Meister your customer support tasks
FastCustomer - Telephone hold application.