TCC, also referred to as "TinyCC", is a small and fast C compiler written in C. It supports ANSI C with GNU and extensions and most of the C99 standard.

This library provides a C99 implementation of compression algorithms, currently limited to Huffman encoding and decoding.

Kefir is an independent compiler for the C17/C23 programming language, developed by Jevgenij Protopopov. Kefir has been validated with a test suite of 80 software projects, among which are GNU core- and binutils, Curl, Nginx, OpenSSL, Perl, Postgresql, Tcl and many others. The compiler targets x86_64 architecture and System-V AMD64 ABI, supporting Linux, FreeBSD, NetBSD an OpenBSD.

The Permuted Congruential Generator (PCG) extends the Linear Congruential Generator (LCG) with a permutation function to increase output randomness while retaining speed, simplicity, and conciseness.

Relaxed Radix Balanced Trees are an immutable vector-like data structure with good performance characteristics for concatenation and slicing.

The UDUNITS-2 package provides support for units of physical quantities. Its three main components are:

1. udunits2lib, a C library for units of physical quantities;

2. udunits2prog, a utility for obtaining the definition of a unit and for converting numeric values between compatible units; and

3. an extensive database of units.

Sparse is a semantic parser for C and is required for Linux development. It provides a compiler frontend capable of parsing most of ANSI C as well as many GCC extensions, and a collection of sample compiler backends, including a static analyzer also called sparse. Sparse provides a set of annotations designed to convey semantic information about types, such as what address space pointers point to, or what locks a function acquires or releases.

sfsexp is a C/C++ library to read, parse, modify, and create symbolic expressions.

This library is a C99 implementation to read TOML text documents.

This library is compatible with the v1.0.0 specification of the language.

This package is an attempt at bringing smart pointers like C++'s unique_ptr and shared_ptr to C through GCC's cleanup attribute.

The libwuya library implements data structures such as dictionaries, skip lists, and memory pools.

simdutf is a C++ library providing Unicode routines (UTF8, UTF16, UTF32). These routines are optimized for many specific architectures using SIMD (Single Instruction, Multiple Data) instructions.

The libsais library provides fast linear-time construction of suffix array (SA), generalized suffix array (GSA), longest common prefix (LCP) array, permuted LCP (PLCP) array, Burrows-Wheeler transform (BWT) and inverse BWT based on the induced sorting algorithm with OpenMP support for multi-core parallel construction.

This package provides a header-only C library, that implements several sorting algorithms. It is configured using macros and supports user-defined types.

StringZilla is a C/C++ header-only string library which relies on SIMD and SWAR. It implements string search, edit distances, sorting, lazy ranges, hashes and fingerprints.

This library provides a C99 client implementation of the Simple Storage Service (S3) protocol for object storage.

The c-siphash project is a standalone implementation of SipHash in Standard ISO-C11. It provides a streaming-capable API to compute data hashes according to the SipHash algorithm. For API documentation, see the c-siphash.h header file, as well as the docbook comments for each function.

The aml library provides a portable event loop for C, with the following features:

1. file descriptor event handlers

2. timers and tickers

3. signal handlers

4. idle dispatch callbacks

5. thread pool support

This manual explains the C language for use with the GNU Compiler Collection (GCC) on the GNU/Linux system and other systems. We refer to this dialect as GNU C. If you already know C, you can use this as a reference manual.

This library provides a C99 wrapper for hash, HMAC, and ECC cryptographic primitives for the AWS SDK.

cproc is a C compiler using QBE as a backend, supporting most of C11 along with some GCC and C2x extensions.

This library provides a C99 framework for constructing event-driven, asynchronous network application protocols.

mimalloc is a drop-in replacement for malloc.

This library provides a C99 implementation of the Message Queuing Telemetry Transport (MQTT) publish-subscribe messaging protocol.