Team Time Zone - Local clocks for distributed teams who use Slack
ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
Timezone.io - Keep track where and when your team is.
Enigmail - Security extension to Mozilla Thunderbird and SeaMonkey
Every Time Zone - Online tool for keeping up with times around the world.
Mailvelope - Mailvelope open source project. OpenPGP in your browser.