Windows System Control Center
WSCC is a free, portable program that allows you to install, update, execute and organize the utilities from various system utility suites (Sysinternals, NirSoft). WSCC is only an interface, you need to download and install the utilities separately. Alternatively, WSCC can use the http protocol to download and run the programs.
The included Update Manager can check for newer versions of the utilities already installed and can download and install the missing items.