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35 stars written in C
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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 23,828 4,999 Updated Nov 5, 2025

A little tool to play with Windows security

C 20,962 3,990 Updated May 11, 2025

Sandboxie Plus & Classic

C 16,271 1,823 Updated Nov 7, 2025

Flipper Zero firmware source code

C 15,038 3,159 Updated Nov 6, 2025

Program to decode radio transmissions from devices on the ISM bands (and other frequencies)

C 6,994 1,450 Updated Oct 29, 2025

Dump1090 is a simple Mode S decoder for RTLSDR devices

C 2,716 1,394 Updated Jan 21, 2024

One true awk

C 2,141 181 Updated Aug 5, 2025

Lua RTOS for ESP32

C 1,301 234 Updated Oct 13, 2025

Dump1090 is a simple Mode S decoder for RTLSDR devices

C 1,075 318 Updated Aug 14, 2024

Bare-metal Raspberry Pi project that provides pixel-perfect sampling of Retro Computer RGB/YUV video and conversion to HDMI

C 957 127 Updated Feb 13, 2024

Transmit LoRa Frames Without a Radio

C 864 59 Updated Nov 4, 2025

NRSC-5 receiver for rtl-sdr

C 860 106 Updated Oct 18, 2025

Trial port of the rtl_433 Library for use with OpenMQTTGateway on a ESP32 and a CC1101 Transceiver

C 622 159 Updated Sep 17, 2025

Flipper Zero Firmware

C 434 56 Updated Dec 19, 2022

rx_fm, rx_power, and rx_sdr tools for receiving data from SDRs, based on rtl_fm, rtl_power, and rtl_sdr from librtlsdr, but using the SoapySDR vendor-neutral SDR support library instead, intended t…

C 385 74 Updated Aug 6, 2024

GreatFET firmware and host software

C 341 101 Updated Jun 3, 2025

Software defined receiver for wireless M-Bus with RTL-SDR

C 260 50 Updated Aug 26, 2024

Improved version of Digistump avr core for Arduino

C 238 46 Updated Apr 2, 2024

A collection of standalone AVR projects written in C

C 178 56 Updated Sep 8, 2023

Alternative culfw

C 128 65 Updated Oct 13, 2022

C implementation of KeeLoq algorithm, equipped with a function to generate algebraic equations of KeeLoq over GF(2)

C 105 28 Updated Mar 16, 2021

Bit array parsing and encoding utility library in C

C 97 53 Updated Jul 6, 2021

tx_sdr tool for transmitting data to SDRs using SoapySDR

C 51 11 Updated Apr 20, 2024

HydraFW dedicated to HydraBus v1 / HydraNFC Shield v2

C 48 14 Updated Nov 3, 2025

A command-line tool to control 433MHz OOK based devices

C 42 4 Updated Dec 13, 2018

New PiRTO multicart for Intellivision, now based on Pico clone

C 41 1 Updated Oct 18, 2025

For JQ6500 owners without the upload tool on the device.

C 37 4 Updated Oct 24, 2022
C 36 30 Updated Mar 27, 2022
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