My Time Zone is a browser extension for automatic time zone conversion. Just highlight to convert between time zones.
Tropic is a simple and free tool that lets you see where your remote coworkers are in their working day (and everyone can set their own unique working hours).
Spacetime allows your team to set their work hours and automatically detects and handles time zone conversions for you.
It moves conversations like “what time is it for you?” and “when do you start your day tomorrow?” into a simple dashboard and Slack bot. Simply message the bot (@spacetime 3pm) and get the answers you need.