WolframAlpha - WolframAlpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.
Line Graph Maker - Create a line graph for free with easy to use tools and download the line graph as jpg or png file.
SpeedCrunch - SpeedCrunch. SpeedCrunch is a high-precision scientific calculator featuring a fast, keyboard-driven user interface. It is free and open-source software, licensed under the GPL. Download Documentation Donate .
Desmos - A beautiful, innovative, and modern online graphing calculator.
Numi App - Numi is a beautiful text calculator for Mac.
GeoGebra - GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching.