Hi,
At Koru we have created a User Interface framework that runs smooth touch graphics on a MCU, like Cortex-M4 (e.g. ST's STM32F4 Dev board), we also work on Linux, NetBSD, Mac and PC.
Our value proposition is that wearable creators can design any type of user interface for any type of device, and by changing a style sheet make same application run on a rectangular or round display, where one might be built on top of a MCU and the other on top of a CPU.
We often get comments that this is something not seen before. We are keen to hear if you in the community have sen others.
Love to hear from you,
Christian