Qimo: Ubuntu for Kids; and Ubunchu: Manga Comic for Kids
Qimo is a desktop operating system designed for kids. Based on the open source Ubuntu Linux desktop, Qimo comes pre-installed with educational games for children aged 3 and up.
Qimo’s interface has been designed to be intuitive and easy to use, providing large icons for all installed games, so that even the youngest users have no trouble selecting the activity they want.
More details here.
Ubunchu, a manga-style comic for kids about the joys of running the Ubuntu Linux operating system. It’s a free, CC-licensed PDF, and it’s been translated into a very large number of languages, and there are more editions to come.