Time Zone Converter - Time Zone Converter is an online productivity tool to calculate exact time across time zones.
Timezone.io - Keep track where and when your team is.
Slash TZ - Natural language time zone converter for Slack & Hipchat
Time Zone Pro - A beautiful world clock for friends, family, clients and more
Jive Chime - Real-time messaging for your team
Spacetime - Work hour and time zone management for distributed teams.