The AI-native database built for LLM applications, providing incredibly fast hybrid search of dense vector, sparse vector, tensor (multi-vector), and full-text.

:zap: The Mobile Robot Programming Toolkit (MRPT)

ONNX Runtime: cross-platform, high performance ML inferencing and training accelerator

An official lightweight library for the RaBitQ algorithm and its applications in vector search.

A modern, C++-native, test framework for unit-tests, TDD and BDD - using C++14, C++17 and later (C++11 support is in v2.x branch, and C++03 on the Catch1.x branch)

A C++ header-only HTTP/HTTPS server and client library

DoltLite - Version Controlled SQLite

Real-time media stack and lightweight libwebrtc alternative, built in C++20

The Official MongoDB driver for C language

C++ Driver for MongoDB

Fast, flexible and simple GUI.

a pure C++ implementation (& redesign) of libc and the standard library

Table Maker for Modern C++

Convenient unified display of the most relevant technical and tag data for video and audio files.

Open-source library of optimized deep learning operations (matmul, convolution, attention) for CPUs (x64, AArch64, RISC-V) and Intel GPUs. Used by PyTorch, TensorFlow, OpenVINO, and ONNX Runtime.

DoltLite - Version Controlled SQLite

An open-source C++ library developed and used at Facebook.

Tensor library for machine learning

HarfBuzz text shaping engine

A tool for use with clang to analyze #includes in C and C++ source files

A C++, header-only library for constructing JSON and JSON-like data formats, with JSON Pointer, JSON Patch, JSON Schema, JSONPath, JMESPath, CSV, MessagePack, CBOR, BSON, UBJSON, toon-format

C++ ODBC wrapper

SIMD-accelerated distances, dot products, matrix ops, geospatial & geometric kernels for 16 numeric types — from 6-bit floats to 64-bit complex — across x86, Arm, RISC-V, and WASM, with bindings for Python, Rust, C, C++, Swift, JS, and Go 📐

A collection of C++ HTTP libraries including an easy to use HTTP server.

Up to 100x faster strings for C, C++, CUDA, Python, Rust, Swift, JS, & Go, leveraging NEON, AVX2, AVX-512, SVE, GPGPU, & SWAR to accelerate search, hashing, sorting, edit distances, sketches, and memory ops 🦖

Fast Open-Source Search & Clustering engine × for Vectors & Arbitrary Objects × in C++, C, Python, JavaScript, Rust, Java, Objective-C, Swift, C#, GoLang, and Wolfram 🔍

Wangle is a framework providing a set of common client/server abstractions for building services in a consistent, modular, and composable way.

A C++14-compatible physical units library with no dependencies and a single-file delivery option. Emphasis on safety, accessibility, performance, and developer experience.

LadybugDB a graph database

SDK for building cross-platform desktop apps in ANSI-C

Reading, writing, and processing images in a wide variety of file formats, using a format-agnostic API, aimed at VFX applications.

Platform Abstraction C++ Libraries

C++ image processing and machine learning library with using of SIMD: SSE, AVX, AVX-512, AMX for x86/x64, NEON, SVE for ARM, HVX for Hexagon

An Fast, Intuitive and Type-Safe C++ Enumeration Support Library

Tiny ISO-compliant C++ EXIF and XMP parsing library for JPEG.

HarfBuzz text shaping engine

Public development project of the LAMMPS MD software package

C library for accessing the PostgreSQL parser outside of the server environment

Tensors and Dynamic neural networks in Python with strong GPU acceleration

High-performance write & space optimized transactional storage engine.

Visual Studio Code

LadybugDB a graph database

An official lightweight library for the RaBitQ algorithm and its applications in vector search.

A tasteful, minimal C++ base library.

DoltLite - Version Controlled SQLite

An open-source C++ library developed and used at Facebook.

JUCE is an open-source cross-platform C++ application framework for desktop and mobile applications, including VST, VST3, AU, AUv3, LV2 and AAX audio plug-ins.

PCRE2 development is based here.

A collection of C++ HTTP libraries including an easy to use HTTP server.

Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks

Wangle is a framework providing a set of common client/server abstractions for building services in a consistent, modular, and composable way.

Event-driven C library focused on networking, with built-in HTTP, WebSocket, data structures and crypto

qpdf: A content-preserving PDF document transformer

Precision documentation from OpenAPI, MCP, Doxygen, and Markdown guides. Static HTML you own.

A fast & densely stored hashmap and hashset

An Open Source Implementation of the Actor Model in C++

A collection of std-like single-header C++ libraries

a clean C library for processing UTF-8 Unicode data

Maybe the world's fastest logging library. Lightweight & industrial-grade, battle-tested in Honor of Kings. C++/Python/Java/C#/Kotlin/TS/Go, Unity/Unreal/HarmonyOS. 可能是全球最快的日志库——轻量级且工业级，源自《王者荣耀》，支持多语言多平台

Tensor library for machine learning

Extremely fast, in memory, serialization, reflection, and RPC library for C++. JSON, BEVE, BSON, CBOR, CSV, JSONB, MessagePack, TOML, YAML, EETF

Cross-platform asynchronous I/O

The Official MongoDB driver for C language

SIMD-accelerated distances, dot products, matrix ops, geospatial & geometric kernels for 16 numeric types — from 6-bit floats to 64-bit complex — across x86, Arm, RISC-V, and WASM, with bindings for Python, Rust, C, C++, Swift, JS, and Go 📐

An official lightweight library for the RaBitQ algorithm and its applications in vector search.

Precision documentation from OpenAPI, MCP, Doxygen, and Markdown guides. Static HTML you own.

High-performance write & space optimized transactional storage engine.

Large collection of number systems providing custom arithmetic for mixed-precision algorithm development and optimization for AI, Machine Learning, Computer Vision, Signal Processing, CAE, EDA, control, optimization, estimation, and approximation.

XLSX I/O - C library for reading and writing .xlsx files

A C++ header-only HTTP/HTTPS server and client library

DoltLite - Version Controlled SQLite

An open-source C++ library developed and used at Facebook.

C++ modules for plotting, graphing and data visualization

High performance library for creating, modiyfing and parsing PDF files in C++

Parsing Expression Grammar Template Library

A collection of C++ HTTP libraries including an easy to use HTTP server.

An official lightweight library for the RaBitQ algorithm and its applications in vector search.

Slint is an open-source declarative GUI toolkit to build native user interfaces for Rust, C++, JavaScript, or Python apps.

SQLiteC++ (SQLiteCpp) is a smart and easy to use C++ SQLite3 wrapper.

Wangle is a framework providing a set of common client/server abstractions for building services in a consistent, modular, and composable way.

HarfBuzz text shaping engine

Apache Kvrocks is a distributed key value NoSQL database that uses RocksDB as storage engine and is compatible with Redis protocol.

Lossless compression C library built for ultra-fast decode. Faster than LZ4 (40-75%+ on ARM64), at a better ratio. Official Rust, Python, Node.js, Go and WASM bindings. Write-once/read-many, with optional seekable archives for O(1) random access.

A production-ready C++ vector graphics engine supporting SVG and Lottie formats, featuring advanced rendering backends such as WebGPU for high-performance graphics.

brpc is an Industrial-grade RPC framework using C++ Language, which is often used in high performance system such as Search, Storage, Machine learning, Advertisement, Recommendation etc. "brpc" means "better RPC".

CodeChecker is an analyzer tooling, defect database and viewer extension for static and dynamic analyzer tools.

Roaring bitmaps in C (and C++), with SIMD (AVX2, AVX-512 and NEON) optimizations: used by Apache Doris, ClickHouse, Alibaba Tair, Redpanda, YDB and StarRocks

A C++ header-only YAML library

This release contains over 160 commits, focusing on the technical debts cleaning including refactorings, bug fixes, test coverage improvement, and option cleanups. The release also includes…

3D geometry processing SDK: fast mesh boolean, mesh repair, decimation, remeshing, offset, point cloud triangulation and ICP registration. C++ with Python, C#, C and JavaScript bindings.

mimalloc is a compact general purpose allocator with excellent performance.

The Official MongoDB driver for C language

Optimized primitives for collective multi-GPU communication

Protocol Buffers - Google's data interchange format

DoltLite - Version Controlled SQLite

A library for efficient similarity search and clustering of dense vectors.

C++ Driver for MongoDB

C++14 concurrent lock-free low-latency queue.

A minimalist Swiss Army knife for C++.

ROS 2 localization for outdoor robots: IMU, wheel encoders and GPS fused in a 23-state UKF at 100 Hz. When the estimate goes wrong it reports which sensor and why, instead of drifting silently. Apache 2.0.

Extremely fast, in memory, serialization, reflection, and RPC library for C++. JSON, BEVE, BSON, CBOR, CSV, JSONB, MessagePack, TOML, YAML, EETF

Event-driven C library focused on networking, with built-in HTTP, WebSocket, data structures and crypto

RPC framework based on C++ Workflow. Supports SRPC, Baidu bRPC, Tencent tRPC, thrift protocols.

The libdispatch Project, (a.k.a. Grand Central Dispatch), for concurrency on multicore hardware

An open-source C++ library developed and used at Facebook.

Tensor library for machine learning

Open h.265 video codec implementation.

A collection of C++ HTTP libraries including an easy to use HTTP server.

C++ parser generator for dissecting protocols & files.

A fast & densely stored hashmap and hashset

Wangle is a framework providing a set of common client/server abstractions for building services in a consistent, modular, and composable way.

C++ based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)

Unicode routines (UTF8, UTF16, UTF32) and Base64: billions of characters per second using SSE2, AVX2, NEON, AVX-512, RISC-V Vector Extension, LoongArch64, POWER. Part of Node.js, WebKit/Safari, Ladybird, Chromium, Cloudflare Workers, Ghostty and Bun.

DoltLite - Version Controlled SQLite

All-in-one solution for creating networked applications with RPC, pub/sub, server deployment, and more.

Kokkos C++ Performance Portability Programming Ecosystem: The Programming Model - Parallel Execution and Memory Abstraction

LadybugDB a graph database

A lightweight C++ logging library

The Official MongoDB driver for C language

C++ Driver for MongoDB

ONNX Runtime: cross-platform, high performance ML inferencing and training accelerator