Desmos
A wonderful browser-based graphing tool that allows students to quickly and effectively visualize data in addition to running simple regressions.

Geogebra
A math construction tool that lets students explore concepts in geometry and graphing in an intuitive way.

Expii
A website designed for lifelong learners who wish to challenge themselves to keep their most advanced skills in topics like Science and Mathematics sharp. The highlight of the community is Expii Solve which challenges the users with unique problem solving experiences.

SpaceHack
Become a citizen scientist by joining in on community science projects! You can do something as simple as linking your computer to help process large computations or actually engage and analyze images or submit data.

PhET
A huge amount of accurate scientific interactive models to explore to get a better idea of key topics.

TinkerCAD
A fantastic resource to start to learn CAD using a primitive-based interface. Not only can students design pieces from scratch, they can also tinker with other uploaded public models as well.

Lego Mindstorms
Lego’s block-based interface to program their EV3 bricks.

Bricklink Studio
A CAD-style interface to build out of Lego!

Khan Academy
A fantastic collection of videos on almost every academic subject covered in school, in addition to targeted SAT prep. An engaging profile tracking system also encourages students to continue practicing and refining their skills rather than just watch review videos right before an exam.

The Big History Project
The Universe around us is not just cleanly cut up into Science, Social Studies, and all the other academic subjects and this project attempts to view the history of everything through a holistic lens. For example, it can blend Chemistry with History, Sociology, and Economics just to discuss something as seemingly simple as the element Silver.

OK GO Sandbox
Resources to pair with OK GO’s math and science-infused videos highlighting how fundamental academic concepts work into their art.