V12 Data - V12 Data offers rich data sets with verified addresses and emails for personalized marketing campaigns.
Quizterra - Create, publish and monetize interactive content on your website. Quizterra is a functional quiz making software with great designs, wide functionality, and free embed.
Lotame - Make your data actionable, learn about your most valuable customers, improve ROI by targeting the right audience and increase relevance across screens.
Zembula - Zembula enables marketers to create and embed interactive experiences that are optimized for conversion.
Google Audience Center - 3 votes and 6 comments so far on Reddit
4screens - 4screens is an interactive content creation platform enabling marketers to create engaging interactive content and social experiences.