Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
LibreOffice - Base - Base, database, database frontend, LibreOffice, ODF, Open Standards, SQL, ODBC
Cvent - Cvent's event management software provides event planners with a complete solution to increase event attendance and decrease event costs.
My Visual Database - Using My Visual Database, you can create databases for invoicing, inventory, CRM, or any specific purpose.
Aventri - Aventri's event management technology has helped thousands of brands globally transform the way they plan and execute meetings and events while tracking and improving their business objectives.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.