Program suggestion

Can anyone suggest a small application CLI or GUI that just seems to be "missing" from Linux? Not necessarily an application that exists in Windows, but not in Linux, but a program that would make some part of your Linux experience better. I am just dying to make a cool Linux app/project, but I am lacking ideas. For interface, I am considering console, GTK+ or Qt. For programming language, I am considering Python or C++; I appreciate your ideas. -- As a boy I jumped through Windows, as a man I play with Penguins.