github.com
System Informer is a free, multi-purpose tool for monitoring system resources, debugging software and detecting malware. It offers a detailed view of system activity with graphs and statistics, shows which processes use a file, and lists active network connections. It provides real-time disk access information and detailed stack traces with kernel-mode, WOW64 and .NET support, and can create, edit and control services. It requires Windows 10 or higher, is portable with no installation, and is released under the MIT license.