RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
Castle Game Engine - An open-source 3D/2D game engine for ObjectPascal.
Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.
Cyberix3D - Free online 3D Game Maker. Make your own 3D games online!
Slickdeals.net - Slickdeals: The Best Deals, Coupons & Discounts on everything
Open 3D Engine - Open 3D Engine is an open-source 3D game development engine in real-time.