Educational Software To Donate With Laptop?

SlartibartfastJunior writes "I will be sending my four-year-old laptop to a school in Uganda this fall. I plan to load up an older version of Windows (or something free), and I need suggestions - what should I load on it? I need suggestions for educational games, educational software, etc. that won't drain my battery too much (since the computer will only be able to recharge at night), won't require a CD (since my drive doesn't work 80% of the time), and won't be too America-centered (most of these children have never been more than ten miles out of their own villages, and wouldn't understand "Oregon Trail"). Also, any great ideas on where I can acquire copies of this software?"