Looking for an opensource tool that offers real Android and iOS devices for Native Mobile App testing

Currently I am in the process of evaluating a tool for Native Mobile App testing. Although I know we can use Appium to write automation scripts, I am looking for a tool that could offer us real Android and iOS devices against which we can run our Appium scripts. I have already looked into Browser Stack, Saucelabs and Device anywhere. They all cost and wanted to know if there is a free open-source tool for this