Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Microsoft Office Access - Access is now much more than a way to create desktop databases. It’s an easy-to-use tool for quickly creating browser-based database applications.
Event Hunt - Startups and Tech Events Curated By Locals
My Visual Database - Using My Visual Database, you can create databases for invoicing, inventory, CRM, or any specific purpose.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.