Facebook Events - Facebook Events enables businesses to organize gatherings, manage invitations and send notifications and reminders to their audience.
SocialPilot - SocialPilot is an app designed to help businesses and professionals with social media marketing.
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Fomo - Fomo turns your site into the online equivalent of a busy store
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Buzzstream - Build Relationships. Build Buzz. Web-based software that helps the world’s best marketers promote their products, services and content.