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

PHPmaker - PHPMaker is a powerful automation tool that can generate a full set of PHP quickly from MySQL, PostgreSQL, Oracle, Microsoft Access, Microsoft SQL Server and SQLite databases.

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

VFront - VFront is a dynamic front-end for MySQL or PostgreSQL databases written in PHP and Javascript.

Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.

PHPRunner - PHPRunner builds visually appealing web interface for popular databases.