SupportYard - Simple and efficient email support. Convert email requests into tickets and keep them organized
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
OmniChat by Freshchat - Engage, sell, and support from anywhere
Dynamic Campaigns by Sigstr - Share the most relevant content in every email
Nolt - A free, fast & beautiful way to collect user feedback