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Process Hacker
A free, powerful, multi-purpose tool that helps you monitor system resources, debug software and detect malware.
Official Website
Nightly BuildsSystem requirements
Windows 7 or higher, 32-bit or 64-bit.
Features
A detailed overview of system activity with highlighting.
Graphs and statistics allow you quickly to track down resource hogs and runaway processes.
Can't edit or delete a file? Discover which processes are using that file.
See what programs have active network connections, and close them if necessary.
Get real-time information on disk access.
View detailed stack traces with kernel-mode, WOW64 and .NET support.
Go beyond services.msc: create, edit and control services.
Small, portable and no installation required.
100% Free Software (GPL v3)