Edorble – A 3D Virtual Classroom. I was delighted when I first saw Edorble because I felt it offered the opportunity for any teacher to set up their own 3D virtual classroom and start teaching online for free. Check out the link below.
Next is a video from Vizia that I saw on "Free tech for teachers" It allows you to add interactive quizzes to youtube videos and puts an end to passive viewing. Check out the video and links below.