Lurchr - Saves all your Slack links, so you can focus on work

Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

Slack News Feed - Get the top posts from every Slack chat you're in.

Event Hunt - Startups and Tech Events Curated By Locals

Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets