Update: 21-09-16

Screenleap

@A04AGEJSA-screenleap

Screenleap allows you to share your screen instantly with other members of your team. This integration is only available when using Slack in Chrome.
To start a screen share, enter /leap in any channel. You will be given a link which you can post to your team members. They will be able to see your screen by simply clicking on the link.
Chrome is currently required to share your screen, but viewing can be done from any device with a browser. The integration is also not currently compatible with the Screenleap for Mac and Screenleap for Windows apps.