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Messenger Video Calls - Facebook Messenger, now with HD video calls
Clearbit for Slack - Send all signups directly to a Slack channel
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
Photostash - Automatically save your pictures from Slack to Gdrive
CallKite - Your website’s video call center in just one click.
Slack It - A bookmarklet to share links in Slack with one click