While the specific tools included can vary depending on the version of macOS and the package, restoretools.pkg typically includes a variety of command-line utilities. Some of the key features and tools you might find in restoretools.pkg include:
RestoreTools is Unix-native. To run it on Windows, use Windows Subsystem for Linux (WSL):
provides high levels of customization for flashing internal firmware to prototypes and development hardware. MobileRestore
A primary feature of the RestoreTools.pkg package is its inclusion of image3maker