Exigo is a new desktop environment project, being developed in Python and C++ using GTK+ as the GUI toolkit. The main aims of Exigo are usability, simplicity, and flexibility. Exigo also aims to introduce new concepts to the desktop, such as the use of tabs instead of standard windows. It mainly revolves around a desktop search engine, which indexes all your applications and files, and displays a list of matching files and apps when the user searches for something. See a mockup here, and read docs here. Please note that there is no release yet.