ReminderCube

ReminderCube is a simple personal agenda that includes the most common productivity tools for your daily work at the office: a calendar, a task list, a reminder app, a program launcher and even a mini-reader for your favorite RSS feeds.

All these tools are displayed in separate windows which you can show or hide at will. In this way you can leave opened only those that you really use.

However, it seems that the program doesn't keep this configuration and shows all of them again when you restart it. Regarding appearance, the interface looks a bit clunky despite the author's efforts to make it attractive by using skins, themes and gradients.