Some open source projects, like Ubuntu and Drupal, are known as more women-friendly environments. Ubuntu’s code of conduct, for instance, set expectations about appropriate behaviour and help foster an environment where women feel more welcome and less threatened. DrupalChix say that Drupal has 10% women on the project, thanks to the supportive environment that group helps create.
But to the best of my knowledge, there are only two open source projects in the world which a) have a significant number of developers, and b) are majority female. They are An Archive Of Our Own (a project of the Organization for Transformative Works) and Dreamwidth.



