Line Graph Maker - Create a line graph for free with easy to use tools and download the line graph as jpg or png file.
Giac/Xcas - Free computer algebra system
Desmos - A beautiful, innovative, and modern online graphing calculator.
GeoGebra CAS Calculator - Free online algebra calculator from GeoGebra: solve equations, expand and factor expressions, find derivatives and integrals
GeoGebra - GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching.
Geometry Pad - Geometry Pad is a dynamic geometry application for iPad and Android tablets.