Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
DialogTech - DialogTech is an end-to-end call attribution and conversion platform.
Event Hunt - Startups and Tech Events Curated By Locals
Invoca - Call tracking & analytics software
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
CallTrackingMetrics - Know who is calling and how they found you. Maximize the return on your advertising.