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Though MS Visio is a powerful tool that ensures creation of perfect network diagrams and individual icons even but still if anyone wants to try any other software then here is the list:
There are many other drawing software available on the Internet that you can use as per your requirements.
For me, I have been using visio for the last six years, and there is nothing better than it.
If you really want an alternative, probably E-Draw Max would be a good alternative.
LibreOffice Draw
Dia
Pencil Project
and all are free