site de softwares:

GAMS com licenca: http://www.gams.com/
GAMS demo: ftp://143.54.45.100/Cursos/Pos/ProcInt/Gams19_6/
gPROMS com licenca: http://www.psenterprise.com/
gPROMS sem licenca: ftp://143.54.45.100/Pub/Software/Dos/gproms.zip
MATLAB: http://www.mathworks.com/