Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Slack - A messaging app for teams who see through the Earth!
Carrd - Simple, responsive one-page site creator.
Mattermost - Mattermost is an open source alternative to Slack.
mmm.page - Dead simple, drag & drop personal websites
Project Sonoma - The one-stop app for deskless workers by Microsoft