CareKit

Apple:

Care doesn’t only happen at the doctor’s office. That’s why Apple created CareKit. An open source framework, CareKit allows developers to build beautiful apps that leverage a variety of customizable modules. CareKit apps will let users regularly track care plans, monitor their progress, and share their insights with care teams. Since CareKit is open source, developers can build upon existing modules and contribute new code to help users world wide create a bigger—and better—picture of their health.

You can find CareKit on GitHub here and the CareKit blog over here.