Quizzes for Pages - Quizzes for Pages is an application to create and share quizzes on your Facebook Page.
Unity - The multiplatform game creation tools for everyone.
Outgrow - Enabling marketers boost conversion with interactive, beautiful & viral quizzes/calculators.
Godot Engine - Feature-packed 2D and 3D open source game engine.
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.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.