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.
OneTime - Multiple timezones on one simple dial
Enigmail - Security extension to Mozilla Thunderbird and SeaMonkey
Klok - Keep track of anything with Klok's simple work timer and visual display of how your days...
Mailvelope - Mailvelope open source project. OpenPGP in your browser.