DisplayFusion - DisplayFusion will make your multi-monitor life much easier.
htop - htop - an interactive process viewer for Unix. This is htop, an interactive process viewer for Unix systems. It is a text-mode application (for console or X terminals) and requires ncurses. Latest release: htop 2.
Mizage Divvy - Divvy is an entirely new way of managing your workspace.
gtop - System monitoring dashboard for terminal
WindowGrid - Quickly and easily layout windows on a dynamic grid using just the mouse.
nmon - This systems administrator, tuner, benchmark tool gives you a huge amount of important performance...