Slack - A messaging app for teams who see through the Earth!
Timezone.io - Keep track where and when your team is.
9mCollab - Collaborate (efficiently) Conclude (fast) Contribute (in the knowledge base)
Every Time Zone - Online tool for keeping up with times around the world.
Mattermost - Mattermost is an open source alternative to Slack.
Time Zone Pro - A beautiful world clock for friends, family, clients and more