Ubuntu is an entirely open source operating system built around the Linux kernel. The Ubuntu community is built around the ideals enshrined in the Ubuntu Philosophy: that software should be available free of charge, that software tools should be usable by people in their local language and despite any disabilities, and that people should have the freedom to customize and alter their software in whatever way they see fit. Source: https://help.ubuntu.com/10.04/about-ubuntu/C/index.html
Dave Hall Consulting started using ubuntu with the very first release, 5.10, back in 2005. Since this time we have been involved in the community. DHC has been an active support of the Australian group, the Ubuntu-au LoCo. We have also worked with developers to identify bugs and test fixes, and assisted in getting up to date versions of applications required for modern web based environments included in releases.
Project Website: http://ubuntu.com