ANSI C

cJSONDaveGamble/cJSON

An ultralightweight, single-file JSON parser and printer written in portable ANSI C.

nanopbnanopb/nanopb

A small code-size Protocol Buffers implementation in ANSI C for embedded systems and memory-constrained environments.

PorcupinePicovoice/Porcupine

A highly-accurate, lightweight, on-device wake word detection engine powered by deep learning.

yyjsonibireme/yyjson

A high-performance, portable, and strict JSON library written in ANSI C, capable of reading/writing gigabytes per second.

mpcorangeduck/mpc

A lightweight and powerful parser combinator library for C, enabling easy parsing of languages and data formats.

wolfsslwolfSSL/wolfssl

A lightweight, portable TLS/SSL library written in ANSI C for embedded systems, RTOS, and cloud applications.

UnQLitesymisc/unqlite

An embedded, serverless, transactional NoSQL database engine with key/value and JSON document store capabilities.

Genanncodeplea/genann

A minimal, well-tested library for training and using feedforward artificial neural networks in ANSI C.

LeptonicaDanBloomberg/leptonica

A C library for efficient image processing and analysis, widely used in OCR and computer vision applications.

libharulibharu/libharu

A free, cross-platform C library for generating PDF files with support for text, images, fonts, encryption, and CJK encoding.

CANopenNodeCANopenNode/CANopenNode

A free and open-source ANSI C implementation of the CANopen protocol stack for embedded control systems.