Stable version is recommended for most of the users. Most Linux distribution already include a Deskbar-Applet package. Refer to your distribution's software installation instructions. You can also install Deskbar-Applet from source code.
Development version is meant for developers and for those who want to try out the latest features and improve Deskbar-Applet. This version is likely to have bugs. Please help us to track'em down. Visit the Get involved page.
There is currently no separate development release.