You probably want to describe what language could be used and such.You can pretty much develop and write Applications in any language and run it through the Terminal.Are you looking for a shell/Bash script ? Purely Linux ? That screen shot you posted is quite difficult to understand.
I would Imagine python would work well, not sure about bash though. The apps in the screenshots are unrelated from my idea, but they showcase some of the components needed: mainly a power bar controlled by arrow keys and the ability to automatically run a specific command based on information entered by a user. Windows support would be nice, but not if it costs much extra to implement.