TL:DR; Lock My PC Free Edition is a good and free alternative to standard Win+L Windows lock.
Lock My PC Free Edition is a good and free alternative to standard Win+L Windows lock. Use it every time when you leave your computer unattended.
Block multiple web site that you specify. Add individual sites to be blocked one at a time or load many sites from a file. There is a feature to password protect this software so that your settings can not be changed.
User Control allows you to block any undesired window title or any application / EXE-file. On the Internet you can define exactly which contents shall be allowed and which not. Varied blocking possibilities for Windows Internals.
Small Windows utility that can quickly enable and disable USB ports. It has interface and runs from the system tray. You can control the devices from the right-click context menu or main graphical form. It allows users to control USB devices such as,