Sugar is a free and open source desktop environment designed with the goal of being used by children for interactive learning.
Ranked in these QuestionsQuestion Ranking
Great tool for children. Not only for learning things interactively, but also to be introduced to Open Source computing in a playful manner.
Sugar uses Activities, which are apps that involve and engage the user in order to encourage him to learn. These activities save the results to a journal where reflections are recorded.
Con Focused on kids only
This desktop environment is focused on children. No reason for any adult to use it what so ever.