Programming

for children
http://scratch.mit.edu/

open source software_math

SageMath
http://www.sagemath.org/

scilab
http://www.scilab.org/

freemat
http://freemat.sourceforge.net/

Octave
http://www.gnu.org/software/octave/

cnc 刀具路徑

線上練習寫 cnc g code的網址
https://nraynaud.github.io/webgcode/