Here are a list of some useful websites to browse.
Maths
www.mathsisfun.com
www.multiplication.com
www.homeschoolmath.net/online/
www.fun4thebrain.com
English
www.starfall.com
www.eclipsecrossword.com/
www.literacyshed.com
Science
www.nationalgeographic/kids.com
www.bdi.ie/mambo/
www.scispy.ie/
http://www.howourlungswork.com
Miscellaneous
http://www.woodlands-junior.kent.sch.uk/
www.primaryresources.co.uk