sfcrazy writes "The general tendency within the open source community is to a whole new wheel to push your own cart. A majority of open source projects are suffering from duplication. Luckily, we just noticed a great example of such collaboration (or using resources by different competing projects) within the distro community. Ubuntu's popular Unity shell is being ported to Fedora (the distro which leads the development of Gnome shell and its also the breeding ground of many latest technologies which are used by the rest of the GNU/Linux world). Interestingly developers users openSUSE's build service to create this port. openSUSE leads the development of Gnome and KDE along with LibreOffice."
Calling Unity "popular" seems like a stretch, but it's certainly where a lot of Ubuntu work has been lavished; the cooperation that open source code fosters at least lets whoever wants to use or develop it do so.