A presentation I originally gave at the 5th Girl Geek Dinner Milano October 24th, 2008 with the contribution of Bruna Gardella. An introduction to Open Source, the world of women and Open Source, and the Girl Geek and Open Source. * What is Open Source (OS) * Why Open Source * Open Source in the world * The Girl Geek and the Open Source World * How to Contribute * Appendix A: Some Open Source Alternatives for Proprietary Software