“I’m doing a (free) operating system (just a hobby, won’t be big and professional like gnu).”
Thirty-four years since Torvalds posted to comp.os.minix asking what people wanted in an OS. He wanted to call it Freax. An FTP admin uploaded it as Linux without asking. Now it runs everything from your phone to the cloud to the Mars helicopter. Still maintained by a guy who yells at people on mailing lists. Open source at its finest.