Which software is used to design this Cirucit?
The software is ExpressPCB. This software includes two applications called ExpressPCB and ExpressSCH, one for drawing schematics, the other for PCB layout. 

The original post of this image is this, and in the end of the post the Author says what software he used.


  In the following zip file you will find the schematics in ExpressSCH
  format and also the PCB artwork in ExpressPCB (both pieces of software
  can be freely downloaded from the Internet):