Qimo (pronounced "kim - oh") is a customized, and customizable, operating system built off the Ubuntu Linux platform for children ages 3 up to about 12. The interface has been optimized and designed for a child with lots of interactive features and what I call "big kid buttons." Take a look at the screen shots here.
The system really looks good with the added features that will help children grow in a safe computing environment. Michael and Michelle Hall are the founders of QuinnCo Inc. which is a non-profit organization that helps put computers in the homes of children with special needs. What they do is to take older computers and remove all data files and load them with educational games that teach computer literacy. It is fun, it is interactive and that is what our kids need to get them interested the appropriate use of computers.
The system requirements are very low "...needs a minimum of 256MB of memory to run from the CD, or 192MB to install. At least 6 GB of hard drive space is recommended, and a 400MHz or faster CPU." So if you are planning to donate they can take computers ranging from a Pentium III class to current machines. You can read about other opportunities to donate at the link above.