The following links are websites visited on a Primary Science and ICT course:
Reaction Test: www.sciencenetlinks.com/interactives/zap.html
Funderstanding Rollercoaster: www.funderstanding.com/k12/coaster/
A free download of Crocodile Clips to simulate electrical circuits:
Sorting and Matching
Help sheets for the Intel Microscope
Please add any other useful primary science websites to the comments below.