Available firmware and projects

FreeRTOS

https://www.freertos.org

https://sourceforge.net/projects/freertos/

Zephyr

https://www.zephyrproject.org

https://github.com/zephyrproject-rtos/zephyr

mynewt

https://mynewt.apache.org/about/

https://github.com/apache/mynewt-core

lupyuen/pinetime-rust-mynewt(Discontinued by Creator)
caspermeijn/klok

MbedOS

https://os.mbed.com

https://github.com/ARMmbed/mbed-os

sethitow/mbed-pinetime
geoffrey.vl/mbed-pinetime

RIOT

http://riot-os.org/

https://github.com/RIOT-OS/RIOT/

bosmoment/PineTime-apps

TinyGo

https://tinygo.org

https://github.com/tinygo-org/tinygo

aykevl/go-smartwatch

wasp-os (MicroPython)

https://wasp-os.readthedocs.io/

https://github.com/daniel-thompson/wasp-os

WaspOS PineTime install guide

Rust + RTFM

https://rtfm.rs/

rtfm-rs/cortex-m-rtfm

https://github.com/dbrgn/pinetime-rtfm/

Bare Metal

https://github.com/xriss/timecake
https://github.com/Arc13/Pyrus

xriss/timecake
Arc13/Pyrus

AdaFruit bootloader

https://github.com/adafruit/Adafruit_nRF52_Bootloader

daniel-thompson/wasp-bootloader

Useful drivers

https://github.com/sethitow/mbed-pinetime

https://github.com/sethitow/mbed-pinetime

Gadgetbridge (Android companion app)

https://gadgetbridge.org/

https://codeberg.org/Freeyourgadget/Gadgetbridge

InfiniTime support in mainline

Arduino

https://youtu.be/4aFDjymXjOw

https://github.com/atc1441/ATCwatch

https://github.com/atc1441/ATCwatch

OTA Update Flasher / DaFlasher

https://youtu.be/gUVEz-pxhgg

https://github.com/atc1441/DaFlasherFiles

https://github.com/atc1441/DaFlasherFiles

InfiniTime companion app for Linux

alexr4535/siglo

Wasp-os companion app for Linux

Siroj42/wasp-companion

UI design proposal

arteeh/pinetime

Flashing app for Linux

arteeh/pinetime-flasher

Flashing app for Windows

ZephyrLabs/PinetimeFlasher

ESP32 / ESP8266 SWD WebFlasher

https://youtu.be/Iu6RoXRZxOk

https://github.com/atc1441/ESP32_nRF52_SWD

InfiniTime companion daemon for Linux

Elara6331/ITD