"A collection of tools to shut down the PC, restart it, suspend it, close a session, etc."
ShutDown Suite is a collection of programs, totally free, divided into two packs. One pack includes all those that need no installation, and the other those that do. All the programs are related to shutting down the PC, and also to restart it, suspend it, close a session, etc.
The big difference between one and the other is that the no-installation programs never ask for confirmation to be run. In other words, if you want to close a session it will do so automatically even if other programs are still running. If you want to close more securely then you should choose the ShutDown Safe program.
All the options in ShutDown Suite are managed from a small icon that installs in the taskbar.