modelling software...

[ArixII]

Hi,
I was testing PIC16F877A for PWM, and visited this site:
https://shibuvarkala.blogspot.com/2009/02/pulse-width-modulation-or-pwm-tutorial.html
on which you see this picture, after the source code it provides:
pwm.jpg (image)
here I see there the writer used a software to model his experiments...could any one please tell me what this software is?

thanks

 

[Pavius]

Labcenter Proteus