Wolfram Alpha
Wolfram Alpha was built to provide knowledge and solve problems. The capabilities are vast, but some features are behind a paywall.
- What it is about.
- Examples of what it is capable of.
- A discussion page for the site.
Desmos
Desmos is a free online graphing utility. It also has a large selection of pre-made lessons for teachers.
GeoGebra
GeoGebra is an online graphing calculator and also creates nice geometric diagrams.
Khan Academy
Khan Academy creates high quality content for many different subjects. For ease of finding links to use for their videos, I would recommend looking at the playlists on their YouTube Channel.
Math Cracker
Math Cracker provides calculators for many different algebraic problems and statistical tests.
Kuta Software
Kuta Software is useful in creating worksheets for many different mathematical courses.