### Sage

Sage is a free open-source mathematics software system licensed under the GPL. It combines the power of many existing open-source packages into a common Python-based...

- Sage supports symbolic maths through Maxima
- Sage needs programming language skills, it doesn't support well symbolic math.

## Closed source mathematics

The main problem with mathematica is that it is not open-source. Ask the software for results and you'll get some, but don't ask how can you arrive to that...

User7501334 on Mathematica

## Good app but...

The biggest problem with Mathematica, is that it's not an open source app. I don't mean it's a problem for the money that it needs to buy it, but if you want...

NightHeron on Mathematica