Counting Cars
http://www.ictgames.com/counting_cars_changecars.html
Sumdog Maths - Talent Quest
(you can play as a guest so you do not require a sign in)
http://www.sumdog.com/student?game=talentshow&scope=world
Sumdog Maths - Tower Climber
http://www.sumdog.com/student?scope=world
Tens Frames
http://illuminations.nctm.org/ActivityDetail.aspx?ID=75
Math Lines - 10
http://www.coolmath-games.com/0-math-lines/
Spacemen - Recognising Number Names 1-20
http://www.primaryonline.co.uk/sitetour/pol/blastoff1.html
Post a Letter - Recognising Numbers up to 100
http://www.ictgames.com/postletter.html
Addition Wall
http://notjustsums.com/TheWallAddition.html
Subtraction Wall
http://notjustsums.com/TheWallSubtract.html
Fairy Fog - Sequencing up to 1000
http://www.ictgames.com/fairyfog.html
Calamity's Quest
http://www.bbc.co.uk/schools/starship/maths/games/calamitys_quest/big_sound/full.shtml
Study Ladder
http://www.studyladder.co.nz