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

  • Gemini 3 and 200+ AI Models on One Platform Icon
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  • 1
    pikepdf

    pikepdf

    A Python library for reading and writing PDF, powered by QPDF

    pikepdf is a Python library allowing the creation, manipulation, and repair of PDFs. It provides a Pythonic wrapper around the C++ PDF content transformation library, QPDF. Python + QPDF = “py” + “qpdf” = “pyqpdf”, which looks like a dyslexia test and is no fun to type. But say “pyqpdf” out loud, and it sounds like “pikepdf”. pikepdf is a library intended for developers who want to create, manipulate, parse, repair, and abuse the PDF format. It supports reading and write PDFs, including creating from scratch. Thanks to QPDF, it supports linearizing PDFs and access to encrypted PDFs.
    Downloads: 6 This Week
    Last Update:
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  • 2
    OICQ

    OICQ

    Tencent QQ Bot Library for Node.js

    OICQ is a fast, feature-rich QQ client library for Node.js, enabling developers to interact with the QQ messaging platform programmatically.
    Downloads: 4 This Week
    Last Update:
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  • 3
    syncthing-android

    syncthing-android

    Wrapper of syncthing for Android

    Syncthing is a continuous file synchronization program. It synchronizes files between two or more computers in real time, safely protected from prying eyes. Your data is your data alone and you deserve to choose where it is stored, whether it is shared with some third party, and how it’s transmitted over the internet. None of your data is ever stored anywhere else other than on your computers. There is no central server that might be compromised, legally or illegally. All communication is secured using TLS. The encryption used includes perfect forward secrecy to prevent any eavesdropper from ever gaining access to your data. Every device is identified by a strong cryptographic certificate. Only devices you have explicitly allowed can connect to your other devices.
    Downloads: 4 This Week
    Last Update:
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  • 4
    libdatachannel

    libdatachannel

    C/C++ WebRTC network library featuring Data Channels, Media Transport

    libdatachannel is a C++ library that implements WebRTC DataChannels and ICE transports, enabling peer-to-peer communication without relying on media components. It is ideal for developers who want efficient, low-latency P2P communication for data transmission in IoT, multiplayer games, decentralized apps, or custom signaling architectures. Built for performance and minimalism, it allows fine-grained control over STUN, TURN, DTLS, and SCTP layers, with a clean and modern C++ interface.
    Downloads: 2 This Week
    Last Update:
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  • 5
    CDT

    CDT

    Constrained Delaunay Triangulation (C++)

    CDT is a C++ library for generating constraints or conforming Delaunay triangulations.
    Downloads: 1 This Week
    Last Update:
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  • 6
    PDFSticher

    PDFSticher

    Code repository for PDFStitcher, a utility to stitch together PDFs

    The open source PDF stitching software for sewists, by sewists. PDFSticher is a utility for stitching together many PDF pages from one document into a single page. This is also called "N-Up" or page imposition. This program was created in order to convert sewing patterns into a convenient format for projecting, though it could be used to stitch together any PDF. Since version 0.4, it is also possible to select layers for inclusion/exclusion in the final output. Additionally, line properties can be modified for each layer if the input PDF is compatible.
    Downloads: 1 This Week
    Last Update:
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  • 7
    Survey Developer Library 4 Java

    Survey Developer Library 4 Java

    Java framework with reusable patterns and classes

    A generic Java framework with reusable patterns and classes for enhanced development
    Downloads: 1 This Week
    Last Update:
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  • 8
    CrossDB

    CrossDB

    Ultra High-performance Lightweight Embedded and Server OLTP RDBMS

    CrossDB is a ultra high-performance, lightweight embedded and server OLTP RDBMS. It is designed for high-performance scenarios where the main memory can hold the entire database.
    Downloads: 0 This Week
    Last Update:
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  • 9
    Fluid Design

    Fluid Design

    Library for QtQuick apps with Material Design

    Fluid is a collection of cross-platform QtQuick components for building fluid and dynamic applications, using the Material Design guidelines. Online documentation is available at docs.liri.io. We develop using the git flow method this means that the develop branch contains code that is being developed and might break from time to time. If you want to check out a stable version just install one of the releases or clone the master branch that has the latest released version.
    Downloads: 0 This Week
    Last Update:
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  • Stop Storing Third-Party Tokens in Your Database Icon
    Stop Storing Third-Party Tokens in Your Database

    Auth0 Token Vault handles secure token storage, exchange, and refresh for external providers so you don't have to build it yourself.

    Rolling your own OAuth token storage can be a security liability. Token Vault securely stores access and refresh tokens from federated providers and handles exchange and renewal automatically. Connected accounts, refresh exchange, and privileged worker flows included.
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  • 10
    REST Countries

    REST Countries

    Get information about countries via a RESTful API

    Get information about countries via a RESTful API.
    Downloads: 0 This Week
    Last Update:
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  • 11
    Simplistic and experimental python ETL package.
    Downloads: 0 This Week
    Last Update:
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  • 12
    A wrapper around the leJOS NXJ (http://lejos.sourceforge.net/) API that allows easy test-driven development (TDD) of robot code in Java with JUnit.
    Downloads: 0 This Week
    Last Update:
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  • 13
    Beet adds user behavior and performance tracking to a Spring-based Java app. HTTP requests, method calls, and SQL statements are tracked and associated to user and session. includes XML, binary XML, and JDBC loggers. See http://beet.sourceforge.net.
    Downloads: 0 This Week
    Last Update:
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  • 14
    bidict

    bidict

    The bidirectional mapping library for Python

    Depended on by Google, Venmo, CERN, Baidu, Tencent, and teams across the world since 2009. Familiar, Pythonic APIs that are carefully designed for safety, simplicity, flexibility, and ergonomics. Lightweight, with no runtime dependencies outside Python's standard library. Implemented in concise, well-factored, fully type-hinted Python code that is optimized for running efficiently as well as for long-term maintenance and stability. Extensively documented. 100% test coverage running continuously across all supported Python versions. Enterprise-level support for bidict can be obtained via the Tidelift subscription. One of the best things about bidict is that it touches a surprising number of interesting Python corners, especially given its small size and scope. Choose a tier and GitHub handles everything else. Your GitHub sponsorship will automatically go on the same bill you already have set up with GitHub, so after the one-click signup, there’s nothing else to do.
    Downloads: 0 This Week
    Last Update:
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  • 15
    gokv

    gokv

    Simple key-value store abstraction and implementations for Go

    Simple key-value store abstraction and implementations for Go. Redis, Consul, etcd, bbolt, BadgerDB, LevelDB, Memcached, DynamoDB, S3, PostgreSQL, MongoDB, CockroachDB, and many more. There are detailed descriptions of the methods in the docs and in the code. You should read them if you plan to write your own gokv.Store implementation or if you create a Go package with a method that takes a gokv.Store as a parameter, so you know exactly what happens in the background.
    Downloads: 0 This Week
    Last Update:
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  • 16
    libjuice

    libjuice

    JUICE is a UDP Interactive Connectivity Establishment library

    libjuice is a lightweight C library implementing the ICE (Interactive Connectivity Establishment) protocol, facilitating peer-to-peer connectivity through NAT traversal. It's particularly useful for applications requiring direct UDP communication, such as VoIP or real-time media streaming, where establishing a direct connection between peers is essential.​
    Downloads: 0 This Week
    Last Update:
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  • 17
    state-threads

    state-threads

    Lightweight thread library for C/C++ coroutine (similar to goroutine)

    The State Threads Library is a small application library that provides a foundation for writing fast and highly scalable Internet applications (such as web servers, proxy servers, mail transfer agents, and so on) on UNIX-like platforms.
    Downloads: 0 This Week
    Last Update:
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