ApowerPDF - ApowerPDF is a versatile PDF editor which also features as PDF converter, viewer, creator and more. It provides a perfect solution for all users.
LockHunter - It is a free tool to delete files blocked by something you do not know.
Classic PDF Editor - View, Create, Convert and Edit PDF Files
IObit Unlocker - Never Worry about “Cannot Delete Files” on Your PC
Icecream Apps PDF Editor - Excellent powerful tool to edit PDF, annotate PDF, redact, protect and more.
Wise Force Deleter - Delete Any File That Windows Can’t Delete.