Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Deepnote - A collaboration platform for data scientists
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
Gyana - Intuitive easy-to-use report and dashboard tool to stop wasting time on repetitive and tedious tasks.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Cron - Cron Calendar.