LockHunter - It is a free tool to delete files blocked by something you do not know.
RAM Booster (Memory Cleaner) - RAM Booster (Memory Cleaner) is one of the classical applications that act as a powerful RAM booster, enabling you to monitor device storage and RAM information at the same time.
IObit Unlocker - Never Worry about “Cannot Delete Files” on Your PC
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.
EMCO UnLock IT - Unlock file or folder, locked by the system or by an application
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.