Teaching & learning resources created by other people.
http://wikispaces.com/
A wiki building tool; available free for educators and students. Excellent for embeding content from other sites. Wikis provide a great platform for teachers and students to work together in the construction, presentation, analysis and dissemination of knowledge.
http://gimp.org/
The GNU Image Manipulation Program (GIMP), is a graphic editing tool that provides a set of tools almost as complete as Adobe’s Photoshop (without the hefty price tag). I use this software to meet all of my web and graphic design needs, and it does so simply and effectively. One of the nice things about this software is that regular releases bring new features at a constant rate, meaning that if it does not do what you want today, it may do it in six months time.
http://empireonline.com/features/posterletters
A quiz to try and recognise movie posters from a single letter.
http://wikipedia.org/
A giant; world-wide collaborative encyclopedia . Often criticised because anyone can edit it; but most people miss the point that this is what makes it so great. Shunned as a tool for student research, it does in fact make an excellent starting point, with articles that are usually up-to-date, well researched, accurate and comprehensive. It also provides a great vehicle for students to practice skills of information literacy. Students can be asked to consider questions such as “What is the truth?”, “What is a reliable source?”, “Should we trust what we read?”, “How can we use references to decide if a source is reliable?”. Further, by having students contribute to Wikipedia, they can learn to appreciate their own knowledge, learn to work with others, and value being part of something bigger. I believe there is a nobility behind the Wikipedia concept that many people simply fail to see.
As all of the content on Wikipedia is licensed under a Creative Commons license, it is a great source for text and images that students can edit in the course of their learning and teachers can edit in the course of their teaching. As once example, there are many high quality maps on Wikipedia, which can be freely edited and incorporated into teaching resources.