EXPLORIFY is a completely free digital resource used in over 75% of UK primary schools for teaching science.
NATIONAL GEOGRAPHIC FOR KIDS - These primary resources from National Geographic for Science are a great tool for helping pupils with their science.
BBC SCIENCE BITESIZE - This is a great resource to support Science learning across Years 3-6
THE SCIENCE MUSEUM - Lots of learning resources including activities, games and videos.
SUBLIME SCIENCE - 101 awesomely fun science experiments you can do at home with 'stuff' you've already got at home