nmon - This systems administrator, tuner, benchmark tool gives you a huge amount of important performance...
Winaero Tweaker - Universal tweaker software which supports Windows 7, Windows 8, and Windows 8.1.
vtop - vtop is a graphical command-line tool that uses unicode braille to chart CPU and memory usage.
Ultimate Windows Tweaker - Ultimate Windows Tweaker is a freeware Tweak UI Utility for tweaking and optimizing Windows.
iftop - iftop does for network usage what top(1) does for CPU usage.
GIGATweaker - GIGATweaker is a powerfull and compact application that allows you to optimize and tweak your OS.