Is fritzing free? If not, is it compulsory to buy it for project submission?
It is not free, but it can be downloaded for free from their website.
Sign up and Log In to their website > Go to download section > Check the box “I already paid” > Click Download
And, no it is not necessary to use fritzing for, you can use other circuit builders or any other method to showcase your circuit diagram as well.
Let me know if you have any other query.