From the site;
“If you’ve ever struggled with Arduino PWM or Timer coding, I’ve got good news. Runtime Micro is offering a free Windows Desktop app. that lets you generate C++ code for Arduino Timers 1, 2, 3, 4 and 5. This works for MCU card types of Nano, Uno and Mega2560!”
https://runtimemicro.com/Projects/WYSIWYG-Arduino-PWM-Code-Generator