Free & Open-Source Brilliant Premium Alternatives

Math and science interactive courses.

1. Khan Academy ↗
   Free world-class education on the web.
   ●○○Easy · Strong feature parity
2. MIT OpenCourseWare ↗
   All MIT class materials, free.
   ●○○Easy · Strong feature parity
3. SageMath ↗ FOSSPRIVATE
   Open-source math system covering algebra to calculus.
   ●○○Easy · Strong feature parity