Open-source alternatives to Cloudwu Pbc

This project is a formal markdown specification standard that provides a detailed markup syntax definition and a definitive set of rules for parsing plain text into consistent HTML output. It establishes a standardized grammar for structural blocks and inline elements to ensure uniform rendering across different software implementations. The specification is supported by a parser conformance suite and a reference implementation in C and JavaScript to verify that implementations adhere to the standard. It includes a system for implementation verification that compares transformed input strings

WAFer is a C language-based software platform for scalable server-side and networking applications. Think node.js for C programmers.

ARCHIVED - libbson has moved to https://github.com/mongodb/mongo-c-driver/tree/master/src/libbson

Lightweight exception implementation for C

tiny recursive descent expression parser, compiler, and evaluation engine for math expressions

libffi is a foreign function interface library that enables calling functions written in other languages at runtime. It serves as a multi-architecture ABI wrapper and dynamic call frame generator, allowing the execution of external functions based on runtime descriptions of argument types and return values. The project provides a portable interface to handle diverse calling conventions across different hardware architectures and operating systems. It includes capabilities for executable closure allocation, which allows foreign code to trigger callbacks within a host language via jump tables s

Include What You Use is a C++ include optimizer and header dependency analyzer. It identifies unused or missing header includes in source files to reduce project bloat and improve compilation performance. The tool performs static analysis using a Clang-based abstract syntax tree to map symbol usage and track preprocessor effects across different build configurations. It can automatically rewrite source files by inserting or deleting preprocessor directives based on the calculated dependency graph. The system integrates with compilation databases to determine the exact compiler flags used for

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/

NIH Utility Library

Gumbo-parser is a high-performance HTML5 parsing library written in pure C99. It transforms raw markup into a structured document tree by implementing the formal state-machine tokenization and error recovery rules defined in the HTML5 specification. The project serves as an HTML source mapping tool, linking parsed nodes back to their original byte offsets and pointers within the input buffer. This allows for the precise tracking of source locations for elements within the resulting parse tree. Beyond full document processing, the library handles isolated HTML fragments and provides a C-based

This project is a suite of runtime diagnostic tools designed to detect memory leaks, concurrency races, and language-specification violations during software execution. It provides a collection of dynamic analysis tools that identify addressability issues, uninitialized memory usage, and memory safety bugs in applications. The toolset includes a thread safety analyzer to identify data races and deadlocks in concurrent code, as well as an undefined behavior sanitizer to detect operations that violate language specifications. The system covers broad capabilities in memory safety monitoring and

libhv is a high-performance C/C++ network library and event-driven I/O framework used to build TCP, UDP, SSL, HTTP, WebSocket, and MQTT clients and servers. It provides a non-blocking event loop for managing network sockets, timers, and system signals across multiple threads. The project is distinguished by its integrated support for specialized network roles, including a full HTTP web server with RESTful routing and middleware, an MQTT messaging client for IoT communication, and the ability to implement SOCKS5 and HTTP proxies. It also features a reliable UDP implementation to ensure ordered

clib is a C language package manager and dependency manager used to install, update, and manage external C libraries and executable dependencies from remote repositories. It functions as a distribution tool for structuring source code and metadata to publish C libraries and a development toolkit for maintaining consistent build environments. The project provides a framework for C library distribution and dependency resolution, utilizing manifest files to track required library versions and ensure reproducible builds across different systems. It streamlines the C development workflow by managi

simple neural network library in ANSI C

An eventing framework for building high performance and high scalability systems in C.

sds is a C dynamic string library that provides a memory management wrapper for heap-allocated strings. It implements binary-safe storage by tracking string lengths explicitly, allowing the library to handle null characters within data. The library distinguishes itself through a memory architecture that uses interchangeable function pointers for allocation and freeing, enabling the integration of custom memory managers. It utilizes header-stored length tracking to provide constant-time length retrieval and maintains null-terminated buffer padding to ensure compatibility with standard C string

💩 Colour ASCII Art Library

Pblog is a small, low overhead, structured logging library

gperftools is a collection of specialized tools for profiling CPU usage, detecting memory errors, and providing high-performance memory allocation. It provides a memory profiling toolkit for C++ applications, including a sampling CPU profiler and a heap profiler for analyzing consumption patterns. The project includes a high-performance memory allocator designed as a multi-threaded replacement for standard allocation to reduce contention and improve execution speed. It further provides a memory debugger to identify illegal memory access and double frees. The toolkit covers broad diagnostic c

Quake-2 is a game engine designed for the development of first-person shooters and the rendering of three-dimensional environments. It provides the core framework for processing real-time physics and player input within interactive 3D spaces. The engine supports software extensibility, allowing for the direct modification of source code to change gameplay mechanics and engine behaviors. This makes it a resource for retro game engineering and the study of early 3D development techniques. Its technical capabilities include vertex-based software rendering, BSP-tree spatial partitioning, and PVS

An implementation of the MessagePack serialization format in C / msgpack.orgC

C library/compiler for the Cap'n Proto serialization/RPC protocol

s2n is a C-based security library and TLS protocol implementation that serves as a secure network transport layer. It provides a modular cryptographic backend interface to encrypt data streams, manage handshakes, and handle mutual authentication between peers. The project focuses on post-quantum cryptography, integrating quantum-resistant key exchange and digital signatures to protect connections against future computing threats. It distinguishes itself through security hardening measures, such as memory-locked secret storage to prevent keys from being swapped to disk and timing-attack mitiga