This site aims to make high quality PowerPoint slideshows, presentations and other resources available for the teaching of physics, chemistry and biology. It also contains animations and other resources.
Not posted to this group before but wondered if you'd be interested in a totally free video and interactive resource for 11-16s. Curriculum links included for UK.
This page contains free software offers. It's worth keeping an eye on it, as from time to time there will be special offers available.
Crocodile Elementary - now called Yenka Basic Circuits, is well worth a download.