Where on the internet can I find a free, non-shareware
Math symbol text editor? By non-shareware, I mean that
It will not stop working after 30 days and require payment to get codes to unlock the program.

Mathtype is the best! Go to Google and type download mathtype and ull get it but after 30 days there'll be less things like symbols like integral would be gone but the symbols ull need up to high school will stillbe there