CMake

unordered_densemartinus/unordered_dense

A fast, densely stored C++17+ hashmap and hashset using robin-hood backward shift deletion, offering near-drop-in replacements for std::unordered_map/set.

GAZEBOsimgazebosim/gz-sim

An open-source robotics simulator providing high-fidelity physics, rendering, and sensor models for robotics development.

axysaxys1/axys

A multi-platform C++ game engine for 2D games on desktop, mobile, Xbox, and WebAssembly, forked from Cocos2d-x.

Axmol Engineaxmolengine/axmol

A C++ multi-platform game engine for 2D development on desktop, mobile, Xbox, and WebAssembly.

pgRoutingpgRouting/pgrouting

pgRouting extends PostgreSQL/PostGIS with geospatial routing and network analysis functions.

SymEnginesymengine/symengine

A fast C++ symbolic manipulation library with optional wrappers for Python, Julia, Ruby, Haskell, and other languages.

libSRTPcisco/libsrtp

An open-source C library implementing the Secure Real-time Transport Protocol (SRTP) for encrypting and authenticating RTP/RTCP media streams.

Monicelliesseks/monicelli

An esoteric programming language based on Italian comedy 'supercazzole', compiling to C and LLVM.

D++ (DPP)brainboxdotcc/DPP

A lightweight and scalable C++ library for creating Discord bots with full API coverage and efficient caching.

QuickQanavacneben/QuickQanava

C++17/Qt6 library for rendering interactive graphs and node-based editors in QML applications.

LibSourceysourcey/libsourcey

A modular C++20 toolkit for real-time media, WebRTC, and networking, built as a lightweight alternative to libwebrtc.

iceynilstate/icey

A modular C++20 toolkit for real-time media, WebRTC, and networking, combining FFmpeg, libuv, and libdatachannel into a single runtime.

LDCldc-developers/ldc

A portable D programming language compiler using LLVM for modern optimization and code generation.

clidaniele77/cli

A cross-platform header-only C++14 library for building interactive command line interfaces with Cisco-style navigation.

libdivideridiculousfish/libdivide

A header-only C/C++ library that replaces slow integer division instructions with fast shift/add/multiply sequences.

libpqxxjtv/libpqxx

The official C++ client API for PostgreSQL, providing a modern interface to interact with PostgreSQL databases.

OpenTESArenaafritz1/OpenTESArena

A modern open-source engine re-implementing The Elder Scrolls: Arena with quality-of-life improvements.

PCRE2PCRE2Project/pcre2

A portable C library implementing Perl-compatible regular expression pattern matching with Unicode support and optional JIT compilation.

nCinenCine/nCine

A cross-platform 2D game engine written in C++11 with optional Lua scripting, emphasizing performance.

scnlibeliaskosunen/scnlib

A modern C++ library for type-safe and fast text parsing, replacing scanf and iostream.

Q2RTXNVIDIA/Q2RTX

NVIDIA's implementation of Quake II with fully path-traced global illumination using RTX ray-tracing technology.

MiniFBemoon/minifb

A small cross-platform C library for creating windows and rendering 32-bit pixel buffers.

Mach7solodon4/Mach7

A functional programming style pattern-matching library for C++ that provides user-definable patterns and open class hierarchies.

simpleinibrofield/simpleini

A cross-platform C++ library for reading and writing INI-style configuration files with a simple API.

depth_clusteringPRBonn/depth_clustering

Fast and robust algorithm for segmenting Velodyne LiDAR point clouds into objects for autonomous driving applications.

cycloneddseclipse-cyclonedds/cyclonedds

A high-performance, robust open-source implementation of the OMG DDS specification for real-time distributed systems.

Ruckigpantor/ruckig

Real-time, jerk-constrained, time-optimal trajectory generation for robots and machines.

cotiresakra/cotire

A CMake module that automates precompiled headers and single compilation unit builds to speed up C/C++ compilation.

WPILibwpilibsuite/allwpilib

Core libraries for creating robot programs for the FIRST Robotics Competition roboRIO.

toml11ToruNiina/toml11

A feature-rich, header-only C++11/14/17/20 library for parsing and serializing TOML configuration files with full spec compliance.

utf8procJuliaStrings/utf8proc

A clean C library for Unicode normalization, case-folding, and UTF-8 processing.

sist2sist2app/sist2

A fast, multi-threaded file system indexer and search tool with a web interface, supporting text/metadata extraction, thumbnails, OCR, and incremental scanning.

ParselmouthYannickJadoul/Parselmouth

A Python library that provides direct, Pythonic access to Praat's speech processing algorithms from within Python.

CZMQzeromq/czmq

A high-level C binding for ZeroMQ that provides a simpler API, actor framework, and security tools.

SDLPoPNagyD/SDLPoP

An open-source port of the classic DOS game Prince of Persia, built on SDL with modern enhancements and mod support.

stdgpustotko/stdgpu

A C++17 library providing efficient STL-like data structures (vector, unordered_map, etc.) for GPU programming with CUDA, OpenMP, and HIP backends.