Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Google Calendar - Spend less time managing your day & more time enjoying it
tawk.to - tawk.to is a free live chat app that lets you monitor and chat with visitors on your website or from a free customizable page
CalenGoo - Features | 1.0.175 for Android™
JivoChat - JivoChat is a live chat that enables you to talk to visitors on your website
CalendarZ - CalendarZ is a simple yet high-level calendar application, introduced lots of advanced functions and features.