Qt, LibreOffice, OpenStack, Linux itself, WebKit, GStreamer, Wayland just to name a few have both paid and freetime contributions (often from the same people to

Qt, LibreOffice, OpenStack, Linux itself, WebKit, GStreamer, Wayland just to name a few have both paid and freetime contributions (often from the same people too). Neil works for Collabora, we contribute to quite a few projects in our paid time. ;)