Perhaps you should have added some information for those of us who may not be familiar with your choices. Bearing in mind this is an international community. I've done a bit of searching to find these please confirm or correct these so we all know what your preferred options are
Roswell Park is America's first cancer center founded in 1898 by Dr. Roswell Park. His revolutionary model of a “multidisciplinary approach” to cancer — with scientists and clinicians working in concert and in consult — has become the standard by which all modern-day comprehensive cancer centers are measured.
Project Gutenberg is a website offering free epub books and kindle books. The donation would go towards them being able them being able to extend the number of books available.
Software Freedom Law Center is a legal service helping to protect FOSS projects by providing licensing support and Patent defence amongst other services.
FSF can stand for the Football supporters' federation (soccer) but I'm guessing this is not what Jeremy means. I can also stand for the Free Software Foundation a non-profit organisation founded by Richard Stallman to support the free software movement.
Charity: Water - Is a similar charity to WaterAid dedicated to ensuring poor people around the world have access to safe clean water.
Other (please specify) - Anything else. If you have any other suggestions feel free to post them below.
Jeremy: Let me know if I've got any of these wrong.
Edit:Link corrected - Jeremy was referring to the specific charity Charity: Water not WaterAid as I first assumed.