FOSS-compatible smartwatch?

[Carl Fink <carlf@panix.com>]

So, I've owned two smartwatches. Both of them required a proprietary 
Android or iOS app to use many of their features.

Is there such a thing as a Free Software API for smartwatches/personal 
fitness devices? With maybe a FOSS app, and a way to use them with a 
Linux-based PC?

Seems like a pipe dream, but I can hope, right?

--
Carl Fink                           nitpicking@nitpicking.com

Read my blog at blog.nitpicking.com.  Reviews!  Observations!