These materials describe how to develop Gear watch apps for Gear S2 and S3 devices via Tizen Studio, which you can distribute commercially and for free via the Galaxy Apps store.
- Gear S2 / S3 watch overview
- Technical walkthrough of Gear watch app development
- Webinar presentation slideshow: Introduction_Watch_Face_Development_with_Tizen_Studio.pdf
- Webinar presentation video: https://youtu.be/Vp8cRwl_tvo
- Tizen Studio Watch Face Developer Guide
- Tizen SDK: http://developer.samsung.com/gear/develop/sdk
- Watch Face sample application: https://github.com/Samsung-US-Developer-Support/WatchFace