What I found out only recently is that Tizen's UI uses Enlightenment's foundation libraries (EFL), which made me kind of interested in getting a device running it.
Samsung has a range of smartwatches and wearables that run full Tizen (Gear S2, Gear S3, Gear Fit 2).
You can install custom software on these devices, and even SSH in over Wi-fi (which sounds like a crazy thing to do on a watch!).
I made a native EFL app for the Gear S2/S3 that did ship (the client was an European airline). The tools are kind of retro (compared to e.g. Xcode), but they work.
