Apply for the Outreach Program for Women
The Outreach Program for Women is a three month internship program for women to contribute to Free Software projects as full-time paid (USD5000) interns. Internships will normally run from January 2 until April 2, and this round 20 internships are being offered across 10 projects, including GNOME, Wikimedia and Mozilla.
They're especially interested in applications from the Southern Hemisphere, since the timing works relatively well with our academic year. But note that you do NOT have to be a student to apply (nor necessarily southern!).
Deadline is December 3: by then you must have already made a contribution to the project you are interested in.