How can I make a logo free of cost?

I'm curious about how one can create a logo without spending any money. Could you please elaborate on some of the free logo design options available? Specifically, I'm interested in knowing about any open-source software or online platforms that offer logo design tools without requiring a fee. Are there any limitations to using these free options? And lastly, do you have any suggestions on how to ensure the logo remains professional and visually appealing despite being designed free of cost?