The Institute of HeartMath offers a variety of products and services, focusing largely on bio-feedback and education. It's some pretty cool stuff.

From the HeartMath.org site:

The Institute of HeartMath is an internationally recognized nonprofit research and education organization dedicated to helping people reduce stress, self-regulate emotions and build energy and resilience for healthy, happy lives. HeartMath tools, technology and training teach people to rely on the intelligence of their hearts in concert with their minds at home, school, work and play.

Visit the Institute of HeartMath website to learn more.