Followerwonk - Followerwonk by Moz is a Twitter analytics tool to help companies better understand their Twitter followers.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
burrrd. - A beautiful UI that provides you detailed twitter analytics.
Splash - Anyone can create a Splash event, whether you're a company hosting a single event or an individual hosting a personal event like a birthday or wedding. Get Started for Free. Text goes here. X. Full Event Program.
Twitter Ads - Twitter offers targeted ad placement on their ad platform.
Eventzilla - Eventzilla lets you sell tickets online and manage attendees from one integrated application.