Browse free open source C++ Libraries and projects below. Use the toggles on the left to filter open source C++ Libraries by OS, license, language, programming language, and project status.

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  • 1
    Orx: Portable Game Engine

    Orx: Portable Game Engine

    Orx: Portable Game Engine

    Orx is a portable, lightweight, plugin-based, data-driven and extremely easy to use 2D-oriented game engine. As orx is data driven, it allows users to create games with a small number of lines of code and reduces drastically the development time.
    Downloads: 8 This Week
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  • 2
    wxPHP

    wxPHP

    PHP bindings for the cross-platform GUI library wxWidgets.

    wxPHP is a php binding/wrapper for the cross-platform library wxWidgets, which gives you the ability to develop desktop applications using the php programming language. This applications can be executed on windows, linux and macosx using the same code base with a native look and feel. One of the ideas is that you can use your php web applications code base and logic to create native desktop applications that communicate to them transparently. This way you can give your users a seamless and native experience from the desktop while staying in sync with your web apps. There are many more use cases, but we invite you to download and try this project by your self. We hope everyone can enjoy it as much as we have enjoyed developing it.
    Downloads: 10 This Week
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  • 3
    LinAsm

    LinAsm

    Collection of fast and optimized assembly libraries for x86-64 Linux

    LinAsm is collection of very fast and SIMD optimized assembly written libraries for x86-64 Linux. It implements many common and widely used algorithms for array manipulations: searching, sorting, arithmetic and vector operations, unit conversions; fast mathematical and statistic functions; numbers and time converting algorithms; finite impulse response (FIR) digital filters; spectrum analysis algorithms, Fast Hartley transformation; CPU cache friendly functions and extremely fast abstract data types (ADT) such as hash tables b-trees, and much more. LinAsm libraries are written on FASM assembly language. They are stable and have appropriate benchmarks for many units. All libraries are well documented and grouped by their functionality. To get more information about this library, please visit the official web site: http://linasm.sourceforge.net
    Downloads: 19 This Week
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  • 4

    WinPcap v4.1.3 (libpcap v1.7.4)

    Parse pcapng and nanoseconds pcaps

    This is libpcap v1.7.4 library ported to Windows and deployed as WinPcap v4.1.3. It supports pcapng files and pcap files with nanoseconds timestamps. Instruction: 1. Install standard WinPcap 4.1.3 package from http://www.winpcap.org/ 2. On Windows 64-bit * Copy bin\x64\wpcap.dll from archive to \Windows\System32 * Copy bin\wpcap.dll from archive to \Windows\SysWOW64 3. On Windows 32-bit * Copy bin\wpcap.dll from archive to \Windows\System32
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    Downloads: 33 This Week
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  • 5
    POCO C++ Libraries

    POCO C++ Libraries

    Cross-platform C++ libraries with a network/internet focus.

    NOTE: Current source code as well as bugs/patches are on GitHub: https://github.com/pocoproject/poco/ C++ class libraries for network-centric, portable applications, integrated perfectly with the C++ Standard Library. Includes network protocols (Sockets, HTTP, FTP, SMTP, POP3, etc.), SQL database access and XML parsing. Licensed under Boost license.
    Downloads: 6 This Week
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  • 6

    libdxfrw

    library to read dwg & read/write dxf files

    c++ library to read/write DXF files in binary and ascii form and to read DWG from r14 to v2015 Continued at: https://github.com/LibreCAD/libdxfrw
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    Downloads: 17 This Week
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  • 7
    This is a C++ logging library implementation which is accepted to Boost. It aims for extensibility and flexibility while moderately affecting user's application performance. Since being accepted, the library is developed and distributed as a part of Boost. Please, visit www.boost.org for more info.
    Downloads: 8 This Week
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  • 8

    ViennaCL

    Linear algebra and solver library using CUDA, OpenCL, and OpenMP

    ViennaCL provides high level C++ interfaces for linear algebra routines on CPUs and GPUs using CUDA, OpenCL, and OpenMP. The focus is on generic implementations of iterative solvers often used for large linear systems and simple integration into existing projects.
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    Downloads: 16 This Week
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  • 9

    XLSX I/O

    C library for reading/writing values from/to Excel .xlsx files.

    Cross-platform C library for reading values from and writing values to .xlsx files. XLSX I/O aims to provide a C library for reading and writing .xlsx files. The .xlsx file format is the native format used by Microsoft(R) Excel(TM) since version 2007. The library was written with the following goals in mind: - primary focus on data values organized in tables, on not layout or graphics - written in standard C, but allows being used by C++ - simple interface - small footprint - portable across different platforms (Windows, *nix) - minimal dependancies: only depends on expat (only for reading) and libzip (which in turn depends on zlib) - separate library for reading and writing .xlsx files Also includes command line tools to convert between .xslx and CSV files.
    Downloads: 10 This Week
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  • 10
    Settimino

    Settimino

    Arduino Ethernet library for communicating with S7 Siemens PLC

    Small but efficient communication library that allows your sketches the interfacing with Siemens PLC. Works starting from Arduino UNO with the W5100 ethernet shield.
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    Downloads: 27 This Week
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  • 11

    libthreadar

    C++ library to manage threads and any type of exception between them

    Libthreadar is a C++ library providing an abstracted set of C++ *classes* to manipulate threads in a very simple and efficient way from your C++ code. It also handles exceptions thrown from a thread and propagated to another one, when the later is calling the thread::join() method. This let one manage exceptions as simply as it is in C++ single threaded context. Additionally, all the related objects around multi-threading (mutex, semaphore, ...) are provided, under easy to use and independent C++ classes. Other more advanced classes ease the information exchange between threads like scattering and gathering a collection of objects between many threads, or asynchonous buffered information exchanges between two threads. All these C++ classes are easy to use and fully documented
    Downloads: 27 This Week
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  • 12
    Bloaty

    Bloaty

    Bloaty: a size profiler for binaries

    Bloaty is a deep, accurate size profiler for native binaries that tells you where every byte comes from so you can shrink executables and libraries intelligently. It parses binary formats like ELF, Mach-O, and DWARF symbol/debug data without relying solely on toolchain heuristics, letting you attribute size to files, sections, symbols, templates, and even compilation units. Reports can be produced at multiple granularities and diffed across builds to identify regressions introduced by compiler flags, dependencies, or new code paths. The tool is designed to be fast enough for iterative use in developer workflows and CI, making size budgets enforceable rather than aspirational. It also supports data sources such as symbol tables and map files, combining them into coherent, readable breakdowns. Teams use Bloaty to drive systematic size-reduction efforts in embedded, desktop, and mobile software where startup time, memory footprint, or download size matter.
    Downloads: 1 This Week
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  • 13
    Brynet

    Brynet

    A Header-Only cross-platform C++ TCP network library

    Header Only Cross-platform high-performance TCP network library using C++ 11. The server uses two network threads and one logic thread, the client uses one network (also process logic) thread. Every packet size is 46 bytes. Every packet contains the client's id. Server broadcast packets to all clients when recv one packet from any client. The client sends one packet when recv packet from the server and the packet's id is equal self.
    Downloads: 1 This Week
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  • 14
    CNN for Image Retrieval
    cnn-for-image-retrieval is a research-oriented project that demonstrates the use of convolutional neural networks (CNNs) for image retrieval tasks. The repository provides implementations of CNN-based methods to extract feature representations from images and use them for similarity-based retrieval. It focuses on applying deep learning techniques to improve upon traditional handcrafted descriptors by learning features directly from data. The code includes training and evaluation scripts that can be adapted for custom datasets, making it useful for experimenting with retrieval systems in computer vision. By leveraging CNN architectures, the project showcases how learned embeddings can capture semantic similarity across varied images. This resource serves as both an educational reference and a foundation for further exploration in image retrieval research.
    Downloads: 1 This Week
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  • 15
    Clipboard

    Clipboard

    Your new smart clipboard manager

    Your second brain that remembers anything, anytime, anywhere. The Clipboard Project (CB for short) is the oh-so-awesome clipboard manager that's just like a second brain. It's fast and lightweight, feature-packed, and super user-friendly. Anyone can use CB - no matter who you are or what you're working on, from web developers to your Average Joe and even to your grandma. Nothing dares lay more than a few button presses away. We've packed, crammed, and jammed CB full of useful features to increase your productivity in the most effective way possible. Make infinitely different clipboards, manipulate them with full-fat regex, instantly script them all, and way more.
    Downloads: 1 This Week
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  • 16
    CppServer

    CppServer

    Fast and low latency asynchronous socket server & client C++ library

    Ultra-fast and low latency asynchronous socket server & client C++ library with support TCP, SSL, UDP, HTTP, HTTPS, WebSocket protocols, and 10K connections problem solution. Cross platform (Linux, MacOS, Windows) Asynchronous communication. Supported CPU scalability designs: IO service per thread, thread pool. Supported transport protocols: TCP, SSL, UDP, UDP multicast. Supported Web protocols: HTTP, HTTPS, WebSocket, WebSocket secure. Supported Swagger OpenAPI iterative documentation. Supported message protocol based on Fast Binary Encoding.
    Downloads: 1 This Week
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  • 17
    EASTL

    EASTL

    EASTL, Electronic Arts Standard Template Library

    EASTL stands for Electronic Arts Standard Template Library. It is a C++ template library of containers, algorithms, and iterators useful for runtime and tool development across multiple platforms. It is a fairly extensive and robust implementation of such a library and has an emphasis on high performance above all other considerations. If you are familiar with the C++ STL or have worked with other templated container/algorithm libraries, you probably don't need to read this. If you have no familiarity with C++ templates at all, then you probably will need more than this document to get you up to speed. In this case, you need to understand that templates, when used properly, are powerful vehicles for the ease of creation of optimized C++ code. A description of C++ templates is outside the scope of this documentation, but there is plenty of such documentation on the Internet.
    Downloads: 1 This Week
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  • 18
    Effekseer

    Effekseer

    This software is a particle effect editing tool

    Effekseer is an open-source tool designed for creating stunning visual effects for games and multimedia applications. It allows artists and developers to design complex particle effects through an intuitive graphical user interface, supporting various features like particles, beams, and distortion effects. Effekseer supports multiple platforms and integrates seamlessly with popular game engines, enabling the creation of rich visual experiences without extensive programming knowledge.
    Downloads: 1 This Week
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  • 19
    NBind

    NBind

    Magical headers that make your C++ library accessible from JavaScript

    A C++ binding generator that allows seamless integration between C++ and JavaScript/Node.js, enabling native module development.
    Downloads: 1 This Week
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  • 20
    NumCpp

    NumCpp

    C++ implementation of the Python Numpy library

    A Templatized Header Only C++ Implementation of the Python NumPy Library. The main data structure in NumCpp is the NdArray. It is inherently a 2D array class, with 1D arrays being implemented as 1xN arrays. There is also a DataCube class that is provided as a convenience container for storing an array of 2D NdArrays, but it has limited usefulness past a simple container.
    Downloads: 1 This Week
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  • 21
    Plog

    Plog

    Portable, simple and extensible C++ logging library

    Portable, simple and extensible C++ logging library. Plog is a C++ logging library that is designed to be as simple, small and flexible as possible. It is created as an alternative to existing large libraries and provides some unique features as CSV log format and wide string support.
    Downloads: 1 This Week
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  • 22
    Proxy

    Proxy

    Proxy: Next Generation Polymorphism in C++

    For decades, object-based virtual tables have been a de facto implementation of runtime polymorphism in many (compiled) programming languages. There are many drawbacks in this mechanism, including life management (because each object may have a different size and ownership) and reflection (because it is hard to balance between usability and memory allocation). To workaround these drawbacks, some languages like Java or C# choose to sacrifice performance by introducing GC to facilitate lifetime management, and JIT-compile the source code at runtime to generate full metadata. We improved the theory and implemented it as a C++ library without sacrificing performance, proposing to merge it into the C++ standard.
    Downloads: 1 This Week
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  • 23
    QxOrm library

    QxOrm library

    C++ Qt ORM (Object Relational Mapping) and ODM library

    QxOrm library is an Object Relational Mapping (ORM) and Object Document Mapper (ODM) database library for C++ Qt developers. QxEntityEditor is a graphic editor for QxOrm library : QxEntityEditor provides a graphic way to manage the data model. QxEntityEditor is multi-platform (available for Windows, Linux, and Mac OS X) and generates native code for all environments, desktop (Windows, Linux, Mac OS X), embedded and mobile (Android, iOS, Windows Phone, Raspberry Pi, etc.). A user manual (documentation) for QxEntityEditor application is available on QxOrm website.
    Downloads: 1 This Week
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  • 24
    Realm Core

    Realm Core

    Core database component for the Realm Mobile Database SDKs

    Realm is a mobile database that runs directly inside phones, tablets or wearables, check out realm.io. This repository holds the source code for the core database component used by all the Realm Mobile Database products. Realm Core is not in itself an "end-user" product with a publicly stable and supported API.
    Downloads: 1 This Week
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  • 25
    Replica Dataset

    Replica Dataset

    High-fidelity indoor 3D dataset for AI simulation and robotics

    Replica Dataset is a high-quality 3D dataset of realistic indoor environments designed to advance research in computer vision, robotics, and embodied AI. Developed by Facebook Research (now Meta AI), it features accurate geometric reconstructions, high-resolution and high dynamic range textures, and comprehensive semantic annotations. Each environment contains detailed models of real-world spaces, including rooms, furniture, glass, and mirror surfaces. The dataset also provides semantic and instance segmentations, planar decomposition, and navigation meshes, making it highly suitable for simulation, visual perception, and autonomous navigation tasks. Replica integrates seamlessly with AI Habitat, Meta’s framework for embodied AI training, enabling large-scale agent simulation and photorealistic rendering for reinforcement learning and robotics. Researchers can use Replica’s ReplicaViewer to interactively explore the 3D scenes.
    Downloads: 1 This Week
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