Also known as JiJi Math, Walnut Grove Elementary has been one of the frontrunners for this software. JiJi is part of the MIND Research Institutes approach to teach math to students by "removing the words". Their founders unique approach can be viewed on the following TED Talks TED Talks — YouTube
Google Applications for Education, also known as GAFE, is a free service to schools. Per Googles website: "As you may know, Google was founded by a research project at Stanford University, and this is just one way we can give back to the educational community." This powerful tool integrates with iOS, OSX, Windows and ChromeOS and allows our staff to produce homogeneous lessons that can be deployed via various hardware without the need for additional professional development for each device.