Another place for the people looking at 'things to do'
http://practicalaction.org/practicalanswers/index.php?cPath=21

The interface of selecting and downloading is interesting...

They used to be known as the ITDG (Intermediate Technology Development Group) and were set up by Fritz Schumacher (Small is Beautiful).

He was called "Fritz" because, as is well known in the UK, All German males are called "Fritz".