Where can I find programs to put Into my 8051. I have a simulator and a programer software.

I can program my single 8051 with some computer interface. I still have to
flip a handful of switches by hand. This might enable me to dicyfer the programing softwares signals. I have one program that I wrote and one that I down loaded.

Soon I will need programs to put into the microproccer, I've tried to write a few in anticiptiation but am bit concerned at how tedious it is. I need a big
code library with something like hex files, and no bugs. I have already put
in the 16 bit multiplication program into a simulator only to find a mistake in
it. It must have tacken half an hour to get it out. It was hardly obvous that some thing could be wrong with the program I downloaded from 8052 microcontroler.