The source code for Pebble smartwatches is now available for download, thanks to Google’s efforts to support volunteers who have kept the watches functional since the company closed in 2016. Pebble, initially launched through Kickstarter, had the most funded project at the time. Despite being discontinued eight years ago, Pebble still has a strong fan base. The released code includes the entire OS, built with FreeRTOS, allowing for custom applications written in C or Javascript via Jerryscript. Some proprietary code was removed, but the hope is that the community and the Rebble project will continue supporting Pebble watches.
https://opensource.googleblog.com/2025/01/see-code-that-powered-pebble-smartwatches.html