Software for drawing schematic diagrams

Question

Is there is any software that can be helpful in drawing professional diagrams such as circuit diagrams and systems diagrams for engineering reports?

For example this diagram

Answer 1

Take a look at TinyCAD

TinyCAD is a program for drawing electrical circuit diagrams commonly known as schematic drawings. It supports standard and custom symbol libraries. It supports PCB layout programs with several netlist formats and can also produce SPICE simulation netlists. It is also often used to draw one-line diagrams, block diagrams, and presentation drawings.

Features

• Flat or Hierarchical Schematic Entry
• Many popular PCB Layout compatible netlist formats
• Convenient support for embedding graphical images in drawings