I love open source software, not just for technological reasons, but also for philosophical reasons. Isn’t it lovely to be able to share things freely and build a better world together? Over the past few years I have tried to convey this love to students, but generally have failed miserably. This year I will try once again, and to help me I have put together a visualisation in order to try and make the situation clear. In designing this I have tried to be as impartial as a fanatic can be, showing that open source is not the right choice for everything, but that it has its place and does some things incredibly well.