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Desmos - A beautiful, innovative, and modern online graphing calculator.
Wheel Decide - Wheel Decide is a free to use web-based spinner platform that allows the people create their own digital wheels system for prize giveaways, decision making, games and much more.
WolframAlpha - WolframAlpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.
RANDOM.ORG - RANDOM.ORG offers true random numbers to anyone on the Internet.
GeoGebra - GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching.
Wheel of Names - Free and easy to use spinner. Used by teachers and for raffles. Enter names, spin wheel to pick a random winner. Customize look and feel, save and share wheels.