Scilab is an open source, cross-platform numerical computational package and a high-level, numerically oriented programming language. Developed by Scilab Consortium
License: Open Source
Sage offers a more comprehensive suite for both symbolic and numerical computations, making it ideal for advanced mathematical work, while Scilab is geared more towards numerical analysis and engineering applications. Both are open-source and cross-platform, but Sage has a stronger focus on symbolic mathematics.