@hichris123 What aspect of Ubuntu? Programs are written in Python, C, C++, C#, Java, Lua (yes, lua), perl, ruby, JavaScript, etc. The kernel is written in C. Ubuntu itself is written in.. I'm not sure what. I think it depends on what part you're working in. Most of Ubuntu is hosted on
LaunchPad, which is sorta similar to github, except it's not. We use baazar (bzr), which is sorta like git, except it isn't.