RETScreen is a Clean Energy Management Software system for energy efficiency, renewable energy and cogeneration project feasibility analysis as well as ongoing energy performance analysis.

RETScreen Expert, an advanced premium version of the software, is available in Viewer mode completely free-of-charge.
لتحميل البرنامج مجانا من الرابط التالي
https://www.nrcan.gc.ca/energy/software-tools/7465