WinSystemXP The ultimate skinable tool to monitor hundreds of system data.
FindTask FindTask shows a lot of system properties of processes, windows, threads, DLLs, desktops. Lets you send arbitrary windows messages and many more.
Autosofted EasyEyes EasyEyes is a brightness and temperature (color) adjustment tool for monitors.
Appointments If you don't want to forget events and don't want to write down on paper
Comandiux Multipurpose command line controlled utility