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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  • 1
    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: 228 This Week
    Last Update:
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  • 2
    AutoClicker

    AutoClicker

    100% Free Auto Clicker, Mouse and Keybord, Macro Recorder

    AutoClicker – Free, fast, and easy automation for your mouse and keyboard. Click automatically at fixed points with custom intervals, repeat counts, and button options. Record and replay mouse and keyboard actions, and save/load sessions for ultimate convenience. Clean, modern interface with multi-language support: Russian, Japanese, Italian, German, and Spanish. 100% free, ad-free, and safe – perfect for repetitive tasks, gaming, testing, or boosting productivity.
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    Downloads: 395 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: 4 This Week
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  • 4
    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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  • 5
    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: 9 This Week
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  • 6
    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: 4 This Week
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  • 7
    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: 7 This Week
    Last Update:
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  • 8
    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
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  • 9
    a Lucene/Solr Analyzer/Tokenizer for documents written in Japanese using Igo morphological analyzer.
    Downloads: 0 This Week
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  • 10
    Karesansui is an open-source virtualization management application made in Japan. It's smart graphical user interface lowers your management cost, and brings a total management/audit solution for both physical and virtual servers. Full featured RESTful interface allows customizing and integration with other management/billing systems.
    Downloads: 0 This Week
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  • 11
    PTLog focuses on pluggability of underlying logging frameworks, type-based categorization and some formatting utility on Logging. PTLog does not compete against any other logging frameworks, but can co-operate with them as abstraction layer on them.
    Downloads: 0 This Week
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  • 12

    VSSDetector

    VSS snapshot path extraction tool for Windows backup operations

    This package includes both English and Japanese versions in the zip file. zipファイルに英語版と日本語版をセットで提供しています。 [English] VSSDetector extracts snapshot paths (VSS paths) from Windows restore points and enables backup software to use these snapshot paths as copy sources. This allows backup processes to copy "files in an unchanging state from a specific point in time," making it possible to edit current files even during backup operations. This enables individuals, creators, developers, and others to back up large amounts of valuable files they own using free tools like 7-Zip without expensive software, and store them in remote locations. [日本語/Japanese] VSSDetectorはWindowsの復元ポイントからスナップショットのパス(VSSパス)を抽出し、バックアップソフトのコピー元としてスナップショットのパスを指定できるようにする。これによりバックアップ処理は「過去のある時点での変化しない状態のファイル」をコピー元にでき、処理中も最新ファイルを編集することが可能となる。 これにより個人、クリエイター、開発者などが所有する大量の貴重なファイルを、高価なソフトなしに、7-Zipなどでバックアップし遠隔地などで保管することが可能となる。
    Downloads: 0 This Week
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  • 13

    Webkosa

    Webkosa is the open source edition of Webcrossing.

    Webkosa is the public, open source edition of the popular Webcrossing server which has been used by thousands of sites for online communities, social networks and agile Web 2.0 object-oriented development. Webkosa includes its own integrated web server, email server, ftp server, out-of-the-box forums with discussions, users and authentication, post-by-email and numerous other user and community-oriented features to get you started with development, or use as is. Webkosa includes a native object-oriented NoSQL database, which is scriptable with its enhanced server-side JavaScript. Webkosa's all-in-one architecture makes deployment easy with no "extra servers" required. By modifying and adding scripts it is infinitely customizable. Webkosa is sponsored by Elliptics, Ltd., the owner of the Webcrossing software product line, and was launched by both Elliptics, Ltd. and Bayspire, Inc.
    Downloads: 0 This Week
    Last Update:
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  • 14
    Defunct project.
    Downloads: 0 This Week
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