The versions plugins is useful to get information about your installation.
This plugin displays all the versions of all the libraries, plugins, tools used in your installation.
Libraries are first determined at compile time, but they can change version over time and the runtime version in your installation could be off. Being able to see such information gives you a way to debug the application if required.
The plugins are the brain of added functionality to your system. Having their version displayed can be useful to know whether you are running the latest or, as it happens once in a while, a specific version that works better for you than the current latest.
Some Unix tools are used by plugins and those tools details get shown. For example, the antivirus makes use of a command line tool to determine whether a file in infected by a virus or not. That tool information can be crucial to know whether you have the correct version installed.