Ada Lovelace

Augusta Ada King, Countess of Lovelace (10 December 1815 – 27 November 1852), born Augusta Ada Byron and now commonly known as Ada Lovelace, was an English mathematician and writer chiefly known for her work on Charles Babbage's early mechanical general-purpose computer, the analytical engine. Her notes on the engine include what is recognised as the first algorithm intended to be processed by a machine; thanks to this, she is sometimes considered the world's first computer programmer.
The computer language Ada, created on behalf of the United States Department of Defense, was named after Ada Lovelace.

"Ada Lovelace Day" is an annual event celebrated on October 16th whose goal is to "raise the profile of women in science, technology, engineering and maths". The Ada Initiative is a non-profit organization dedicated to increasing the involvement of women in the free culture and open source movements.
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Ada Lovelace Day: Women celebrate female scientists - BBC  

Ada Lovelace Day Celebrates Women in Science - National Geographic

Celebrate Ada Lovelace Day - CNet

Celebrating Women in Technology for Ada Lovelace Day 2012 - EFF