Slack - A messaging app for teams who see through the Earth!
Mattermost - Mattermost is an open source alternative to Slack.
Takle - Messenger for inter-business communication Replace email and personal messengers in cooperation between companies
Project Sonoma - The one-stop app for deskless workers by Microsoft
Mahmee - A digital support network for new moms
Loop Email - Emailing for teams: Organize your Inbox into channels 💌