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98 stars written in C
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Linux kernel source tree

C 229,217 61,635 Updated Apr 16, 2026

Cross-platform asynchronous I/O

C 26,772 3,864 Updated Apr 2, 2026

Alternative firmware for ESP8266 and ESP32 based devices with easy configuration using webUI, OTA updates, automation using timers or rules, expandability and entirely local control over MQTT, HTTP…

C 24,268 5,073 Updated Apr 15, 2026

Primary Git Repository for the Zephyr Project. Zephyr is a new generation, scalable, optimized, secure RTOS for multiple hardware architectures.

C 15,000 8,992 Updated Apr 16, 2026

Embedded web server, with TCP/IP network stack, MQTT and Websocket

C 12,696 2,902 Updated Apr 15, 2026

RT-Thread is an open source IoT Real-Time Operating System (RTOS). https://rt-thread.github.io/rt-thread/

C 11,896 5,381 Updated Apr 15, 2026

H2O - the optimized HTTP/1, HTTP/2, HTTP/3 server

C 11,438 879 Updated Apr 15, 2026

Extremely fast non-cryptographic hash algorithm

C 10,979 890 Updated Apr 13, 2026

A little fail-safe filesystem designed for microcontrollers

C 6,580 982 Updated Mar 25, 2026

Protocol Buffers with small code size

C 5,310 1,002 Updated Apr 7, 2026

Simple unit testing for C

C 5,156 1,099 Updated Mar 27, 2026

A full functional WiFi Repeater (correctly: a WiFi NAT Router)

C 5,155 968 Updated Feb 13, 2025

"Das U-Boot" Source Tree

C 5,008 4,362 Updated Apr 15, 2026

C macros for hash tables and more

C 4,703 971 Updated Mar 18, 2026

RF transmitter for Raspberry Pi

C 4,472 575 Updated Sep 30, 2024

This project hosts security advisories and their accompanying proof-of-concepts related to research conducted at Google which impact non-Google owned code.

C 4,414 528 Updated Apr 15, 2026

Minecraft, but I made it in 48 hours.

C 4,392 476 Updated Apr 26, 2024

Open source ARM Cortex-M microcontroller library

C 3,564 1,116 Updated Mar 21, 2026

https://github.com/json-c/json-c is the official code repository for json-c. See the wiki for release tarballs for download. API docs at http://json-c.github.io/json-c/

C 3,261 1,100 Updated Feb 20, 2026

ZSWatch - the Open Source Zephyr™ based Smartwatch, including both HW and FW.

C 3,181 292 Updated Apr 15, 2026

Decompilation of Pokémon Emerald

C 3,079 3,965 Updated Apr 8, 2026

A library of generic data structures for the C language.

C 2,986 331 Updated Jun 27, 2025

Read-only mirror of official repo on openldap.org. Issues and pull requests here are ignored. Use OpenLDAP ITS for issues.

C 2,955 628 Updated Apr 3, 2026

Linux-CAN / SocketCAN user space applications

C 2,825 775 Updated Mar 10, 2026

Read-only mirror of https://review.coreboot.org/coreboot.git. Synced every hour. We don't handle Pull Requests.

C 2,652 610 Updated Apr 16, 2026

Linux Device Drivers 3 examples updated to work in recent kernels

C 2,578 939 Updated Apr 28, 2025

A cross-platform C and C++ unit testing framework for the 21st century

C 2,239 185 Updated Mar 2, 2026

A tiny C header-only risc-v emulator.

C 2,087 163 Updated Dec 21, 2025

Single header library for writing non-blocking HTTP servers in C

C 1,903 153 Updated Jul 4, 2023

Wear-leveled SPI flash file system for embedded devices

C 1,611 415 Updated Feb 10, 2026
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