Top Alternatives to Resource Monitor

Process Explorer is a powerful, free Windows utility from Sysinternals that provides detailed information about running processes, including DLLs loaded, handles open, and resource usage. It's a significant upgrade over the standard Windows Task Manager for advanced users and system administrators.

htop is an advanced interactive system monitor and process viewer for Unix-like systems. It offers a user-friendly, cursor-based interface to manage processes, providing real-time performance data and powerful process control capabilities.

System Explorer is a powerful yet lightweight freeware application that provides detailed insights into your computer's system internals. It functions as an advanced task manager, offering comprehensive information about processes, applications, network activity, and hardware performance, presented in an intuitive interface.

CurrPorts is a lightweight and portable network monitoring utility for Windows. It displays a comprehensive list of all active TCP/IP and UDP connections on your computer, providing detailed information about each connection.

AtMonitor was an advanced system monitoring tool for macOS, providing real-time insights into system activity, hardware usage, process performance, and network traffic. It offered both a graphical user interface and a command-line interface, catering to various user needs.

Glances is a cross-platform, open-source system monitoring tool providing a comprehensive overview of system resources and processes directly from the command line or web interface. Written in Python, it is highly portable and extensible, offering a wealth of information in a dynamic and user-friendly format.

nmon is a powerful and lightweight command-line tool designed for comprehensive system monitoring and analysis on AIX and Linux systems. It provides real-time performance data across various critical areas, including CPU, memory, disk I/O, network activity, kernel statistics, and top processes, making it an essential utility for system administrators and performance analysts.