Although some parts of BeOS (e.g. Tracker and Deskbar UI components) were open sourced with BeOS R5, for the most part the code of the Haiku project has been written from scratch. What helped a ...

on “the inefficien[cy] overhead of simply working at Google.” Some report spending all day on tasks as simple as changing the color of a website button ...

Deskbar modification, it adds a dock to your deskbar where you may have shortcuts organized in "tabs", a tab of the running apps and some other general eyecandy.