EventsBase - Find the best professional events nearby or globally
Photostash - Automatically save your pictures from Slack to Gdrive
Rally by Eventbrite - Find the best local events and rally your friends to join
Google Drive to Slack - Slack notifications whenever you work on Google Drive docs
Event Hunt - Startups and Tech Events Curated By Locals
Slack It - A bookmarklet to share links in Slack with one click