Alarm Clock is the personal alarm clock for GNOME desktop environment. (GPL)

AutoHotkey is a free, open-source utility for Windows. (GPL)

A powerful, speedy, and sexy remote control for your GNOME Desktop. (GPL)

Launchy is a free windows and linux utility designed to help you forget about your start menu, the icons on your desktop, and even your file manager. (GPL)

Parcellite is a lightweight GTK+ clipboard manager written in C, designed to be small, simple and fast. (GPL)

Specto is a desktop application that will watch configurable events (such as website updates, emails, file and folder changes, system processes, etc) and then trigger notifications. (GPL)

Stickies for Windows lets you put yellow sticky notes on your Windows desktop. (Apache)

VirtuaWin is an application for the Windows user community that misses the wonderful virtual desktop functionality often used on Unix systems. (GPL)