LockHunter - It is a free tool to delete files blocked by something you do not know.
Auto RAM Cleaner - Auto RAM Cleaner is a cost-effective application that lowers the burden on the phone by cleaning RAM & background processes when the Screen turns on.
IObit Unlocker - Never Worry about “Cannot Delete Files” on Your PC
RAM Cleanup - RAM Cleanup is one of the powerful applications that clean up your memory to speed up your device, saves battery, and cool CPU in one click.
EMCO UnLock IT - Unlock file or folder, locked by the system or by an application
AVG Cleaner - AVG Cleaner is an application that is developed to make your device run faster and smoother, store more data, free up memory by cleaning junk or RAM usage & stay charged for a long time.