I know others have posted about this website before but I think they have added new games to download.
If you click on the image above you will go to the kindergarten page. They have games for number sense, addition, geometry and teen numbers. The games are great and they go along with the common core standards. The activities involve a lot of ten frame and dot games as well. There is also information about rekenreks, math journals and math read alouds.
If you go here you will find links to interactive whiteboard resources you can play in your classroom. There are so many great things on this website I could spend hours on it!