Sesame Database Manager - Lantica Software, LLC - Sesame, A Q&A-compatible Database Manager.

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

Sheep - Membership and events for SMEs and nonprofits

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

DbFace - DbFace is an online database application & report building tool.

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.