What a treasure trove www.mmiweb.org.uk/publications/opensource.html is! You will find publications, links and lots of amazingly useful teaching and learning materials.
Enjoy the share.
(the following from the site)
There are many applications that are now available as open source. Not all of these are free to institutions but can be very useful if you are asking/expecting students / teachers to have access to software at home. Perhaps the most useful of these is Open Office than will do all the things that office will do but for FREE!
Below are some programmes that are open-source or free applications, there is a growing range of free stuff that you can use and develop – so why pay $£$£$? Some are available for windows, some for Apple and some for both. If you know of other open-source projects that you think would be of use to teachers please mail me or use the forum to let everyone know.