Alternatives and similar repositories for zephyr:

Users that are interested in zephyr are comparing it to the libraries listed below

• STMicroelectronics / arm-trusted-firmware
  Arm Trusted Firmware
  ☆33Updated last week
• linux4sam / at91bootstrap
  Second level bootloader for Microchip SoC (aka AT91)
  ☆113Updated last month
• zephyrproject-rtos / meta-zephyr-sdk
  Zephyr SDK (obsolete)
  ☆44Updated 6 years ago
• zephyrproject-rtos / openocd
  OpenOCD with Zephyr patches for building Zephyr SDK
  ☆36Updated last month
• prattmic / F4OS
  A small RTOS for ARM Cortex-M4F microcontrollers.
  ☆82Updated 6 years ago
• fdu / STM32F429I-disco_Buildroot
  ☆41Updated last year
• nxp-imx / imx-m4fwloader
  Tool for loading firmware to M4 core on i.MX6SX and 7D
  ☆20Updated 4 years ago
• zephyrproject-rtos / trusted-firmware-m
  Zephyr repository tracking https://git.trustedfirmware.org/plugins/gitiles/TF-M/trusted-firmware-m.git
  ☆32Updated this week
• FreeRTOS / FreeRTOS-Labs
  ☆61Updated last month
• ARM-software / NXP_LPC
  CMSIS Driver Implementations for the NXP LPC Microcontroller Series
  ☆30Updated 3 years ago
• apache / mynewt-nffs
  Apache NFFS filesystem
  ☆29Updated 7 months ago
• PelionIoT / mbed-bootloader
  Generic bootloader to be used in conjunction with Pelion Device Management Client
  ☆54Updated 3 years ago
• STMicroelectronics / stm32l4xx-hal-driver
  Provides the STM32Cube MCU Component "hal_driver" of the STM32L4 series.
  ☆45Updated 2 weeks ago
• linux4sam / u-boot-at91
  U-boot for Microchip SoC (aka AT91)
  ☆51Updated last month
• phoenix-rtos / phoenix-rtos-kernel
  Phoenix-RTOS microkernel repository
  ☆133Updated this week
• zephyrproject-rtos / rtos-benchmark
  RTOS Benchmark
  ☆41Updated 3 weeks ago
• ErichStyger / McuOnEclipse_PEx
  McuOnEclipse Processor Expert Source Files and Components
  ☆66Updated 2 months ago
• devicetree-org / devicetree-source
  DTS files
  ☆34Updated 4 years ago
• martinribelotta / elog
  Embedded logger with minimal footprint and memory usage
  ☆36Updated 3 months ago
• ARMmbed / spif-driver
  Block device driver for NOR SPI flash devices that support SFDP, such as the MX25R or SST26F016B
  ☆26Updated 6 years ago
• nucleisys / Bumblebee_Core_Doc
  The directory to save Bumblebee core's documents, just for GD32VF103 RISC-V Core
  ☆41Updated 4 years ago
• beckus / stm32_p103_demos
  A suite of demo applications for the Olimex STM32 P103 Development Kit
  ☆104Updated 3 years ago
• eewiki / u-boot-patches
  ☆45Updated 2 years ago
• martinribelotta / cortex-m-llvm
  DEPRECATED: Use instread https://github.com/ARM-software/LLVM-embedded-toolchain-for-Arm Cortex M3/M4 with LLVM toolkit
  ☆61Updated 3 years ago
• Open-CMSIS-Pack / Open-CMSIS-Pack-Spec
  Common Microcontroller Software Interface Standard - Pack(age) based distribution system
  ☆57Updated last month
• PelionIoT / mbed-coap
  CoAP C library - Builder and Parser for CoAP messages
  ☆29Updated last year
• 32bitmicro / newlib-nano-1.0
  newlib-nano 1.0
  ☆89Updated 10 years ago
• ARM-software / CMSIS-Compiler
  CMSIS Compiler support for Arm Compiler
  ☆27Updated 7 months ago
• gnu-mcu-eclipse / gnu-mcu-eclipse.github.io
  The GNU MCU Eclipse web static site
  ☆25Updated 4 months ago
• EmcraftSystems / u-boot
  U-Boot for Cortex-M3 and Cortex-M4
  ☆183Updated 6 years ago