iMazing - iMazing lets you transfer music, files, messages, apps and more from any iPhone, iPad, or iPod to a computer, Mac or PC. Manage and backup your iOS device simply without iTunes. (was DiskAid)
Flashlight - Control your Mac with a keystroke.
checkra1n - Jailbreak for iPhone 5s through iPhone X, iOS 12.0 and up
Tiny Flashlight + LED - Tiny Flashlight + LED is free to use application that can be used anywhere else, having nicely built-in functionality.
Blackra1n - (This is an OUTDATED jailbreaking method.)
Screen Torch Advanced 2 - "Screen Torch Advanced 2", is an handy torch program. It only uses devices' backlight.