Quizzes for Pages - Quizzes for Pages is an application to create and share quizzes on your Facebook Page.
Redditlater - An app that lets you schedule a post to Reddit
Outgrow - Enabling marketers boost conversion with interactive, beautiful & viral quizzes/calculators.
The Reddit Marketing Code - A guide to cracking the Reddit marketing code
Poll Everywhere - Audience response system that uses mobile phones, twitter, and the web. Responses are displayed in real-time on gorgeous charts in PowerPoint, Keynote, or web browser.
Serializer.io - A compact news reader for HN, Product Hunt and more