LibreOffice - Base - Base, database, database frontend, LibreOffice, ODF, Open Standards, SQL, ODBC
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
My Visual Database - Using My Visual Database, you can create databases for invoicing, inventory, CRM, or any specific purpose.
Facebook Local - Discover places to go and events happening near you
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets