Skype for Slack - Move your slack discussions to a group skype call
The Simple Postcard - Text a photo to mail it as a postcard
Calls on Slack - Make voice calls in Slack
Mailjoy - Delightfully easy direct mail marketing. A DIY direct mail tool created for marketing and growth teams. Design, mail & track personalized direct mail postcards and letters. Digital marketers use Mailjoy to send data-driven mail campaigns.
CallKite - Your website’s video call center in just one click.
MailtoUI.js - Enhance your mailto links with a convenient user interface.