1. Process Explorer shows you information about which handles and DLLs processes have opened or loaded. The display consists of two sub-windows.
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  2. htop is an interactive process viewer for Linux. It is a text-mode application (for console or X terminals) and requires ncurses. htop is an interactive top replacement that runs in the terminal.
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  3. Process Monitor is an advanced monitoring tool for Windows that shows real-time file system, Registry and process/thread activity.
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  4. Glances is a cross-platform monitoring tool which aims to present a large amount of monitoring information through a curses or Web based interface. The information dynamically adapts depending on the size of the user interface.
  5. Process Lasso is NOT yet another task manager. It is a process priority optimization and system automation utility. Priority optimization, affinity optimization, core optimization, automated rules, automated power schemes, you name it and Process Lasso has it.
  6. Windows Task Manager is a task manager application included with Microsoft Windows NT family of operating systems that provides detailed information about computer performance and running applications, processes and CPU usage, commit charge and memory information, network...
  7. System Explorer is an enhanced Taskmanager that provides detailed information about running processes, startup programs, IE add-ons (BHOs), drivers, services network connections, system resources and more.
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  8. Easy to use, with a game inspired menu system. Fast and "mostly" responsive UI with UP, DOWN keys process selection. Function for showing detailed stats for selected process. Ability to filter processes. Easy switching between sorting options.
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  9. API Monitor is a Windows program that lets you monitor and control API calls made by applications and services. Its a powerful tool for seeing how applications and services work or for tracking down problems that you have in your own applications.

    Discontinued

    Last version is from 2013. See: http://www.rohitab.com/apimonitor/changelog

  10. vtop is a graphical command-line tool that uses unicode braille to chart CPU and memory usage. It can be easily extended.
  11. Task Manager DeLuxe (TMX) is based on MiTeC System Information Component Suite and offers powerful features available in standard Windows Task Manager in lightweight portable package with many more enhancements.
  12. SpyStudio is the best product to trace user-mode API calls on Windows. SpyStudio is an Application tracer which shows and interprets calls, displaying the results in a structured way which is easy for any IT professional to understand.
  13. Explore all the tasks (processes) running on your Mac with TaskExplorer. Quickly see a task's signature status, loaded dylibs, open files, network connection, and much more!.
  14. Activity Monitor displays information about all the processes running on your Mac, including CPU, disk, memory, and network usage. You can see exactly how your computer’s resources are being used via a searchable table, helpful graphs, or even directly in the Dock icon.
  15. Process Tamer is a tiny utility that monitors the CPU usage of running processes and automatically lowers the priority of processes that are overloading the CPU until their CPU usage returns to a reasonable level.