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

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    Classic Shell

    Classic Shell

    Start menu and Windows enhancement software

    Classic Shell adds some missing features to Windows 7, 8, 8.1 and Vista like a classic start menu, toolbar for Explorer and others. Note: The software available here is not the latest version. Visit the new website www.classicshell.net to download the latest version and to access the new forums and documentation.
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    Downloads: 215 This Week
    Last Update:
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  • 2
    Naraeon SSD Tools

    Naraeon SSD Tools

    SSD Management Tool

    Naraeon SSD Tools is a SSD Management Tool. It does Manual trim, Secure erase, Firmware update. And it also provides automatic endurance monitor so you can be warned when the SSD goes wrong.
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    Downloads: 55 This Week
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  • 3

    Process Manager for Windows (PMW)

    A easy to use task manager that lets you control your apps

    Process Manager for Windows is a smart Task Manager that lets you manage priority, transparency, visibility of your processes with few clicks. It lets you kill one process or all processes in with just shortcut key and let you gain control of your unresponding windows computer and let you regain all the resources back, of course when killing apps you always have the risk of losing the unsaved data. ================= This tool flourished from 2008 to 2013, and was downloaded over 200K times, However, it was decommissioned in 2013 by the sole developer Arif Ali Saiyed This tool was free with optional donations to milaap.org that raised about $1400 and just that small amount helped 15,372 needy people through microlending and created a new source of income stream for 3401 entrepreneurs. Check out the link below to see the impact you all made by donating. https://milaap.org/users/6877/impact
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    Downloads: 7 This Week
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  • 4
    HTTPS-PROXY-WINDOWS

    HTTPS-PROXY-WINDOWS

    supports https and http protocol proxy;

    The project provides browser http proxy proxy service, supports https and http protocol proxy; can deploy multi-level proxy; supports TLS protocol encryption; mainly uses tools for accessing external websites with intranet hosts;
    Downloads: 11 This Week
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  • 5
    Osenpa Auto Clicker

    Osenpa Auto Clicker

    Windows auto clicker, macro recorder, and desktop automation tool

    Osenpa Auto Clicker is a desktop automation tool for Windows. It combines auto clicking, macro recording, keyboard automation, image detection, and color detection in a single GUI application. Users can build step-based automation flows, save and load profiles, assign hotkeys, and run a packaged Windows executable without installing Python. Main features: - Mouse auto click automation - Keyboard key and hotkey automation - Macro recorder for mouse and keyboard actions - Image detection based automation - Color detection based automation - Profile save/load support - Step-based automation workflow - Multi-language interface - Prebuilt Windows executable Use this software only where automation is allowed.
    Downloads: 17 This Week
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  • 6
    VeilClip

    VeilClip

    Offline clipboard manager for Windows with history, search, and locked

    VeilClip is an open-source, offline clipboard manager for Windows 10 and Windows 11. It stores copied text, links, images, and file paths locally on your PC so you can search, pin, edit, reuse, and protect them later without a cloud account. Main features: - Clipboard history for text, links, images, and file paths - Fast search by content and source application - Favorites and pinned reusable items - Locked Notes protected by a PIN - Built-in text and image editing - Local backup, export, and import - Multi-language interface - Offline-first and privacy-focused design VeilClip uses local storage and does not require a cloud account for normal use.
    Downloads: 8 This Week
    Last Update:
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  • 7
    Just Converter

    Just Converter

    Local Windows file converter for media, documents, images, and PDFs.

    Just Converter is a privacy-first Windows file converter designed for local processing, broad format support, and a clean desktop workflow. It supports conversion across video, audio, images, documents, and PDF files. The app is built for users who want a native Windows utility instead of relying on online converter websites for normal tasks. Key capabilities include video and audio conversion, audio extraction from video, image conversion, image-to-PDF workflows, document and PDF conversion, PDF merge and split, PDF page export to images, and practical batch tools such as file reordering, output naming, and remembered settings. Just Converter is designed to work locally on the user's device for standard conversion workflows, making it a better fit for private documents, internal files, and users who prefer an offline-capable desktop app.
    Downloads: 5 This Week
    Last Update:
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  • 8
    Lucifer

    Lucifer

    Lucifer: The Ultimate Dev-Ecosystem

    "Everything is integrated. Now, even I can't control it." 루시퍼(Lucifer)는 더 이상 단순한 런처가 아닙니다. 개발자가 필요로 하는 모든 하부 구조를 하나로 집대성한, 통제 불가능한 수준의 올인원 통합 제어 환경입니다. 🚀 핵심 특징 (Core Features) 시리얼 제어 (Advanced Serial Control): 하드웨어와의 접점을 완벽하게 장악합니다. 아두이노 및 각종 임베디드 장치와의 데이터 송수신을 가장 드라이하고 정밀하게 수행합니다. 서버 통합 (Terra Server Engine): MariaDB 연동형 고성능 자바 서버 '테라(Terra)'를 코어로 품어, 데이터 처리와 로직 실행의 중심축을 담당합니다. 톰캣 내장 (Embedded Tomcat): 별도의 WAS 설치 없이도 웹 환경을 즉각적으로 구동합니다. 루시퍼가 곧 웹 서버이자 플랫폼이 됩니다. 자바 내장 (Portable Java Environment): 환경 변수 설정이나 버전 갈등에서 완전히 자유롭습니다. 루시퍼 실행 파일 하나에 최적화된 자바 환경이 포함되어 어디서든 즉시 가동됩니다.
    Downloads: 2 This Week
    Last Update:
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  • 9
    BLAZAM

    BLAZAM

    AD Web Management Platform

    Blazam is a web app that lets you manage Active Directory, even from your phone. You can delegate account functions and let your users manage Active Directory objects. Blazam also has user templates, photo management, and recycle bin access. For most up to date info, see https://blazam.org
    Downloads: 1 This Week
    Last Update:
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  • 10
    LSJ-Link

    LSJ-Link

    시리얼 통신 프로그램 (Serial Control Program)

    [Summary / 한글 설명] LSJ-Link는 개발자와 엔지니어를 위한 직관적인 시리얼 통신 터미널 프로그램입니다. 아두이노(Arduino), 임베디드 보드와의 안정적인 데이터 송수신을 지원하며, 복잡한 설정 없이도 즉각적으로 하드웨어를 제어할 수 있도록 설계되었습니다. 루시퍼(Lucifer) 런처의 핵심 통신 엔진을 독립형 버전으로 만나보세요. [Key Features / 주요 기능] Instant Connectivity: 간단한 포트 및 보드레이트(Baud rate) 설정으로 즉시 연결 가능. Real-time Monitoring: 송수신 데이터를 실시간 로그창으로 확인. Lightweight & Fast: 군더더기 없는 로직으로 시스템 자원 점유율 최소화. User-friendly Interface: 직관적인 UI로 초보자부터 전문가까지 쉽게 사용. [Short Description (영문 요약)] LSJ-Link is a high-performance serial communication tool designed for developers working with Arduino and embedded systems. Experience stable data transmission and real-time monitoring with a simple, intuitive interface.
    Downloads: 0 This Week
    Last Update:
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  • 11
    LSJ-Server

    LSJ-Server

    LSJ-Server-Terra (Java Multipurpose Sever connected with MariaDB)

    **LSJ-Server (Terra)**는 MariaDB 연동 순수 자바 기반 고성능 경량 서버입니다. 프레임워크 없이 핵심 기술로만 구축되어 기업 유지보수 및 게임 서버에 최적화된 속도를 보장합니다. [핵심 기능] Java & MariaDB: 신속한 데이터 처리 및 안정적 연동. 실시간 관리: GUI 로그 모니터링 및 유저 관리. 최적화: 다중 접속을 위한 저지연 TCP/IP 환경. [사용 방법] 설정: MariaDB 정보 및 포트(10815) 입력. 제어: '서버 시작/중지' 버튼으로 서비스 관리. 모니터링: 중앙 로그와 우측 유저 목록 확인 및 하단 명령창 제어. LSJ-Server (Terra) is a high-performance, lightweight socket server built with Pure Java and MariaDB. It offers a robust backend for IT maintenance and MMORPG/RTS games without heavy framework overhead. [Features] Pure Java & MariaDB: Fast data processing & persistence. Real-time Monitoring: GUI for live logs and user management. Optimized Networking: Low-latency TCP/IP support. [How to Use] Config: Set MariaDB and Port (default: 10815). Control: Use 'Start' and 'Stop' buttons. Manage: Monitor logs/users and use the bottom command field. https://github.com/s1213123/LSJ-Server/
    Downloads: 0 This Week
    Last Update:
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