CKEditor - Real-time collaborative future-ready rich text editor
Outgrow - Enabling marketers boost conversion with interactive, beautiful & viral quizzes/calculators.
TinyMCE - TinyMCE is a content editor that functions as a plug-in for Wordpress websites.
Quizzes for Pages - Quizzes for Pages is an application to create and share quizzes on your Facebook Page.
Summernote - Summernote is a JavaScript library that helps users create WYSIWYG editors online.
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.