broad support for generic smart watches
Gadgetbridge is pretty well on it’s way to this. They roll out support for new devices monthly it seems like. Of course there are always feature X and Y that fitbit or garmin does that it doesn’t, but it’s quite an impressive project. I use it with a pebble 2 HR.
Not sure why all the downvotes, I use the note to self function for exactly this type of thing all the time. Though to be fair signal is both on my phone and on my computer basically all the time because I use it to talk to everyone too…
EDIT: oh, it’s downvoted because this is the selfhosted community…
Yeah that’s fair. I’ve been running it since about 2018 and never found it too difficult, but messing around with Linux is my hobby so I admit that I enjoy the problem solving aspect. It’s certainly not something you set and forget.
I suggested it here mostly because this particular plugin is both actively developed and quite good in my opinion but it would only be a viable solution if you already use Nextcloud. I’m in no way suggesting OP should install it just for this.
So Nextcloud has a shockingly good 3d model viewer with a long list of supported formats https://apps.nextcloud.com/apps/files_3dmodelviewer . Here’s a quick demo video I made: https://vimeo.com/865805210?share=copy
Unfortunately Nextcloud is a whole can of worms and not just an application you install on your desktop. But it does to all the things you asked for so, worth mentioning I guess? Tagging, sorting, and search are just features of it’s general file management though, they are not really stl specific in any way.
Quick list of supported formats from the github page
3dm Rhino
3ds Autodesk 3D Studio
3mf 3D Manufacturing Format
bim dotbim
brep/brp Boundary Representation
dae Collada
fbx Filmbox
fcstd FreeCAD Standard File Format
glb GL Transmission Format binary
gltf GL Transmission Format separate and embedded
ifc International Foundation Class no XML or compressed
iges/igs Initial Graphics Exchange Specification
obj Wavefront with mtl and textures
off Object File Format
ply Polygon File Format
step/stp Standard for Exchange of Product Model Data
stl Stereolithography Standard Tesselation/Triangle Language ASCII and Binary
wrl Virtual Reality Modeling Language superseded by X3D
Gatgetbridge (your link) has a breakdown of devices they support https://gadgetbridge.org/gadgets/ . You can click through the vendors to find devices which are both “highly supported” and “no vendor-pair”. Meaning most/all the features work without any reliance on the vendor app.
As for the similarity you are asking about with pixel->GrapheneOS, there are very few watches that can run an alternative open source firmware or operating systems apart from the ones that are already open source, like bangle.js, pinetime, etc. Wearables are even more specialized than phones, they require specialized code designed specifically for them and would likely require pretty extreme effort to reverse-engineer.
I use a pebble 2 HR with gadgetbridge but the watch it self runs the old pebble firmware which gadgetbridge talks to. This is fine for me, but if you are looking for a more modern watch you may have to make some compromises.