Zabbix - Track, record, alert and visualize performance and availability of IT resources
LockHunter - It is a free tool to delete files blocked by something you do not know.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
Wise Force Deleter - Delete Any File That Windows Can’t Delete.
Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
FileASSASSIN - FileASSASSIN is an application that can delete any type of locked files that are on your computer.