Alternatives and similar repositories for zephyr:

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

• ARMmbed / mbed-os
  Arm Mbed OS is a platform operating system designed for the internet of things
  ☆4,718Updated 4 months ago
• mcu-tools / mcuboot
  Secure boot for 32-bit Microcontrollers!
  ☆1,401Updated this week
• FreeRTOS / FreeRTOS-Kernel
  FreeRTOS kernel files only, submoduled into https://github.com/FreeRTOS/FreeRTOS and various other repos.
  ☆3,031Updated last week
• RIOT-OS / RIOT
  RIOT - The friendly OS for IoT
  ☆5,445Updated this week
• aws / amazon-freertos
  DEPRECATED - See README.md
  ☆2,542Updated 2 years ago
• apache / nuttx
  Apache NuttX is a mature, real-time embedded operating system (RTOS)
  ☆3,106Updated this week
• FreeRTOS / FreeRTOS
  'Classic' FreeRTOS distribution. Started as Git clone of FreeRTOS SourceForge SVN repo. Submodules the kernel.
  ☆5,688Updated this week
• libopencm3 / libopencm3
  Open source ARM Cortex-M microcontroller library
  ☆3,190Updated last month
• apache / mynewt-core
  An OS to build, deploy and securely manage billions of devices
  ☆850Updated this week
• eclipse-threadx / threadx
  Eclipse ThreadX is an advanced real-time operating system (RTOS) designed specifically for deeply embedded applications.
  ☆3,039Updated last week
• renode / renode
  Renode - Antmicro's open source simulation and virtual development framework for complex embedded systems
  ☆1,739Updated this week
• nrfconnect / sdk-nrf
  nRF Connect SDK main repository
  ☆1,008Updated this week
• u-boot / u-boot
  "Das U-Boot" Source Tree
  ☆4,266Updated this week
• buildroot / buildroot
  Buildroot, making embedded Linux easy. Note that this is not the official repository, but only a mirror. The official Git repository is a…
  ☆2,878Updated this week
• openocd-org / openocd
  Official OpenOCD Read-Only Mirror (no pull requests)
  ☆1,795Updated this week
• littlefs-project / littlefs
  A little fail-safe filesystem designed for microcontrollers
  ☆5,404Updated last week
• ARM-software / CMSIS_5
  CMSIS Version 5 Development Repository
  ☆1,389Updated 5 months ago
• RT-Thread / rt-thread
  RT-Thread is an open source IoT Real-Time Operating System (RTOS).
  ☆10,814Updated this week
• pyocd / pyOCD
  Open source Python library for programming and debugging Arm Cortex-M microcontrollers
  ☆1,173Updated this week
• ARM-software / arm-trusted-firmware
  Read-only mirror of Trusted Firmware-A
  ☆2,004Updated this week
• apache / mynewt-nimble
  Apache mynewt
  ☆738Updated last week
• contiki-os / contiki
  The official git repository for Contiki, the open source OS for the Internet of Things
  ☆3,736Updated 10 months ago
• bluekitchen / btstack
  Dual-mode Bluetooth stack, with small memory footprint.
  ☆1,803Updated this week
• Mbed-TLS / mbedtls
  An open source, portable, easy to use, readable and flexible TLS library, and reference implementation of the PSA Cryptography API. Relea…
  ☆5,704Updated this week
• ARMmbed / DAPLink
  ☆2,406Updated 6 months ago
• pellepl / spiffs
  Wear-leveled SPI flash file system for embedded devices
  ☆1,549Updated last year
• tock / tock
  A secure embedded operating system for microcontrollers
  ☆5,648Updated this week
• seL4 / seL4
  The seL4 microkernel
  ☆4,826Updated this week
• stlink-org / stlink
  Open source STM32 MCU programming toolset
  ☆4,553Updated this week
• devicetree-org / devicetree-specification
  Devicetree Specification document source files
  ☆901Updated 3 weeks ago