Gemini Photos - Clean up your Camera Roll
CleanMyMac X - Clean, protect and speed up your Mac
PhoneClean - PhoneClean is the best and even free iPhone cleaner software for all your iPhone cleaning, maintaining and privacy protecting needs. It brings you the new iPhone, iPad experience that you will appreciate every day.
Fossils - Find and clean out all your old unused files
iMyfone Umate - iMyfone Umate is an iPhone space saver which helps iPhone/iPad/iPod touch users free up iPhone...
DaisyDisk - DaisyDisk is a disk analyzer tool for OS X that visualizes hard disk usage and allows to free up hard disk space.