This is a lightweight C++ option parser library, supporting the standard GNU style syntax for options
An OCR Engine that was developed at HP Labs between 1985 and 1995... and now at Google.
Extended precision integer C++ library
The Open Motion Planning Library, consists of many state-of-the-art sampling-based motion planning algorithms
The Open Motion Planning Library (OMPL), GUI + FCL/Assimp integration
Portable, general-purpose utility library.
A library implementing the so-called Assuan protocol
mlpack is an intuitive, fast, and flexible header-only C++ machine learning library with bindings to other languages.
Tiny Software Protocol for communication over UART, SPI, etc
One of the fastest JSON libraries in the world. Glaze reads and writes from C++ memory, simplifying interfaces and offering incredible performance.
Cairo is a 2D graphics library with support for multiple output devices. Currently supported output targets include the X Window System (via both Xlib and XCB), Quartz, Win32, image buffers, PostScript, PDF, and SVG file output. Experimental backends include OpenGL, BeOS, OS/2, and DirectFB.
Client library to communicate securely with Qb2 LiDAR devices of Blickfeld GmbH.
SQLiteC++ (SQLiteCpp) is a smart and easy to use C++ SQLite3 wrapper.
ISO C++ Core Guidelines Library implementation for C++98, C++11 up
A C++ library for interacting with Telnet streams
C grammar for tree-sitter
A cross-platform FTP/FTPS client library based on Boost.Asio.
ngtcp2 project is an effort to implement RFC9000 QUIC protocol.
Implementation of RFC 9114 HTTP/3 mapping over QUIC and RFC 9204 QPACK in C
dav1d is a new open-source AV1 decoder developed by the VideoLAN and FFmpeg communities and sponsored by the Alliance for Open Media.
Thor Vector Graphics is a lightweight portable library used for drawing vector-based scenes and animations including SVG and Lottie. It can be freely utilized across various software platforms and applications to visualize graphical contents.
C++ wrapper of the open62541 OPC UA library
libunwind official github repo (in need of new / additional maintainer, mail/open issue if interested)
Asynchronous Low Latency C++ Logging Library
Kerbal C++ Template Library
A C++ template library for embedded applications
A header only C++11 glTF 2.0 library.
A library for reading and writing gif images.
The official database access API of postgresql
A single-header C++ library for PIMPLs without having to implement any special member functions.
Cinatra is a high performance HTTP framework with modern C++ features.
A simple, header-only command line parser for C++.
Independent JPEG Group's JPEG software
Contains source for libdwarf, a library for reading DWARF2 and later DWARF. Contains source to create dwarfdump, a program which prints DWARF2 and later DWARF in readable format. Has a very limited DWARF writer set of functions in libdwarfp (producer library). Builds using GNU configure, meson, or cmake.
Very fast, high quality, platform independent hashing algorithm.
Qt Base (Core, Gui, Widgets, Network, ...)
lunasvg is a standalone SVG rendering library in C++
Header-only library for using Keras models in 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 and Bun.
Pluggable caching engine to build and scale high performance cache services.
a TLS 1.3 implementation by Facebook
An open-source C++ library developed and used at Facebook. The library is UNSTABLE on Windows
mvfst (Pronounced move fast) is a client and server implementation of IETF QUIC protocol in C++ by Facebook.
A collection of C++ HTTP libraries including an easy to use HTTP server.
Wangle is a framework providing a set of common client/server abstractions for building services in a consistent, modular, and composable way.
Embedded web server, with TCP/IP network stack, MQTT and Websocket
A Compile time PCRE (almost) compatible regular expression matcher
Roaring bitmaps in C (and C++), with SIMD (AVX2, AVX-512 and NEON) optimizations: used by Apache Doris, ClickHouse, and StarRocks
A type safe embedded domain specific language for SQL queries and results in C++.