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
    WinMerge

    WinMerge

    Windows visual diff and merge for files and directories

    WinMerge is a Windows tool for visual difference display and merging, for both files and directories. It is highly useful for determining what has changed between file versions, and then merging those changes. WinMerge has Unicode support, Flexible syntax coloring editor, Visual SourceSafe integration, and Windows Shell integration. Regexp filtering for filenames and lines. Side-by-side line difference and highlights differences inside lines. A file map shows the overall file differences in a location pane. The user interface is translated into several languages.
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    Downloads: 31,481 This Week
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  • 2
    Double Commander
    Double Commander is a cross platform open source file manager with two panels side by side. It is inspired by Total Commander and features some new ideas.
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    Downloads: 7,022 This Week
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  • 3
    Zero Install
    Zero Install is a decentralised cross-distribution software installation system. Create one package that works everywhere! With dependency handling and automatic updates, full support for shared libraries, and integration with native package managers
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    Downloads: 1,970 This Week
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  • 4
    DropIt

    DropIt

    A flexible tool to automate processing & organizing files and folders.

    When you need to organize files, DropIt can eliminate much of the drudgery of searching and manually opening folders and moving files around. Drop a group of different files and folders on the floating DropIt image and it sorts them to defined destination folders, compresses or extracts them, opens them with associated programs or performs other defined actions. You can define how filter your files (by name, directory, size, date, properties, content or regular expressions) and associate one of the 21 available actions to perform (Move, Copy, Compress, Extract, Rename, Delete, Split, Join, Encrypt, Decrypt, Open With, Print, Upload, Send by Mail, Create Gallery, Create List, Create Playlist, Create Shortcut, Copy to Clipboard, Change Properties and Ignore). You can also organize your associations in profiles and automatically scan monitored folders at a defined time interval.
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    Downloads: 1,843 This Week
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  • 5
    WinDirStat: Windows Directory Statistics

    WinDirStat: Windows Directory Statistics

    A disk usage statistics viewer and cleanup tool for Windows

    WinDirStat (Windows Directory Statistics) is a disk usage statistics viewer and cleanup tool for Windows. On start up, WinDirStat reads the whole directory tree once and then presents it in three useful views. The official download location and collaboration platform for WinDirStat has moved to GitHub: https://github.com/windirstat/windirstat Downloads and source code provided on SourceForge may not always be up to date. They are primarily used for disaster recovery purposes.
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    Downloads: 1,696 This Week
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  • 6
    BleachBit

    BleachBit

    deletes junk files to free disk space and improve privacy

    BleachBit frees disk space and maintains privacy. Cleans cache, Internet history, temporary files, logs, cookies, Firefox, Google Chrome, Flash, Windows, Linux, and more. Downloads are at www.bleachbit.org and source code is at GitHub.
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    Downloads: 1,539 This Week
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  • 7
    UltraDefrag

    UltraDefrag

    Increase your system performance with this easy to use tool

    Please note, here you can find the latest open source release of UltraDefrag (7.1.4). The most recent UltraDefrag release (15.0.0) can be found on our official website: https://ultradefrag.net UltraDefrag is a disk defragmenter for Windows, which supports defragmentation of locked system files by running during the boot process. It is easy to use without any complicated scripting or a huge load of configuration settings. You can filter the files processed by size, number of fragments, file name and path. You can terminate the process early by specifying an execution time limit.
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    Downloads: 1,230 This Week
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  • 8
    LDAP Admin
    Windows LDAP editor, includes support for POSIX groups and accounts, SAMBA accounts, some Postfix objects and more
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    Downloads: 557 This Week
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  • 9
    Securepoint SSL VPN Client

    Securepoint SSL VPN Client

    SSL VPN Client for Windows (OpenVPN).

    SSL VPN Client for Windows (OpenVPN).
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    Downloads: 861 This Week
    Last Update:
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  • 10
    cdrtfe

    cdrtfe

    Burn optical discs in various formats

    cdrtfe is a CD/DVD/BD burning application for Microsoft Windows. You can burn data discs, Audio CDs, XCDs, (S)VCDs and DVD-Video discs. It supports creation and writing of ISO images and bootable discs. cdrtfe has a multi-language interface and is also available as portable version.
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    Downloads: 580 This Week
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  • 11
    USB Oblivion

    USB Oblivion

    Erase all traces of (broken) USB drives from Windows registry

    This utility designed to erase all traces of (broken) connected USB devices - flash-drives, disks and CD-ROMs from computer registry of Windows XP, Windows 2003, Windows Vista, Windows 7, Windows 8, Windows 10 (32/64-bit versions). The utility has a test mode of operation, i.e. without actually removing data from the registry, and, just in case, creates a .reg-file to undo any changes. There is also a fully automatic mode.
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    Downloads: 769 This Week
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  • 12
    Data Crow

    Data Crow

    The ultimate cataloguer

    Data Crow allows you to use the standard movie & video (divx, xvid, DVD, Blu-ray, etc), book (and eBooks), images, board games, comic books, games & software, music (mp3 and other music files) cataloguing modules. Besides these modules, which you can change to fit your requirements, you can create new modules (want to catalogue your stamps, equipment, or anything else?). The GUI is skinnable. Reporting (using JasperReports and their community edition JasperSoft Developer Studio ), loan administration, item importing & exporting, backup & restore and many other optional features are waiting for you.
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    Downloads: 325 This Week
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  • 13
    Areca Backup
    Areca-Backup is a file backup software that supports incremental, image and delta backup on local drives or FTP servers. Areca-Backup also allows you to browse your backups and navigate among different version of the files contained in your archives.
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    Downloads: 299 This Week
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  • 14
    EmuTOS

    EmuTOS

    Free operating system for Atari computers, and more.

    EmuTOS is a TOS compatible operating system for Atari ST series computers, and more. It is made from Digital Research's GPLed original sources and is a free and open source alternative to Atari proprietary ROMs.
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    Downloads: 412 This Week
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  • 15
    CLISP - an ANSI Common Lisp
    CLISP is a portable ANSI Common Lisp implementation and development environment by Bruno Haible. Interpreter, compiler, debugger, CLOS, MOP, FFI, Unicode, sockets, CLX. UI in English, German, French, Spanish, Dutch, Russian, and Danish.
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    Downloads: 247 This Week
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  • 16
    FreeArc combines best 7-zip and RAR features: auto-selected LZMA/PPMD/Multimedia compression, 1gb dictionary, exe/dict/delta data filters, updatable solid archives, SFXes, recovery record, AES+Twofish+Serpent encryption, Linux support and much more...
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    Downloads: 374 This Week
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  • 17
    Copy Handler program is a small tool designed for copy/move files and folders between different storage medias. Currently it works only in Windows systems, however in the future more platforms should be supported.
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    Downloads: 181 This Week
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  • 18
    Synkron
    Synkron is a simple Qt application that allows you to sync folders, for example a flash disk with a folder on your hard disk.
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    Downloads: 148 This Week
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  • 19
    KGB Archiver is the compression tool with unbelievable high compression rate. It surpasses even such efficient compression tool like 7zip and UHARC in terms of the abilities. KGB Archiver uses AES-256 encryption to encrypt archives.
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    Downloads: 227 This Week
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  • 20
    PearPC - PowerPC Emulator
    PearPC is an architecture independent PowerPC platform emulator capable of running most PowerPC operating systems. It includes a JITC for x86-Processors.
    Downloads: 131 This Week
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  • 21
    KShutdown

    KShutdown

    A graphical shutdown utility for Linux and Windows

    KShutdown is a graphical shutdown utility for Linux and Windows. It allows you to turn off or suspend a computer at a specified time. It features various time and delay options, command-line support, and notifications.
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    Downloads: 150 This Week
    Last Update:
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  • 22
    Startup Manager is a program that provides you the possibility to manage the Windows startup procedure. It offers you the possibility to control which programs automatically start up and more.
    Downloads: 149 This Week
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  • 23
    Arabic Keyboard

    Arabic Keyboard

    Arabic Keyboard Phonetic

    Can't Remember the Position of Arabic Letters on your Keyboard? Try This Phonetic Arabic Keyboard Layout. Letters correspond to Latin / English / German Letters of similar pronunciation, which makes it much faster and easier to type. Example: the Arabic Letter Meem "م" can be typed by pressing "M". They Layout can be either used online on arab-key.com or installed as a System Language for macOS and Windows. Includes Arabic, Persian, Kurdish Letters. All Features Free
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    Downloads: 132 This Week
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  • 24
    Robolinux

    Robolinux

    Announcing Robolinux Cinnamon 14.1

    Announcing The New Robolinux Series 14 Mate LTS - 2034 Robolinux is very pleased to announce a completely new 14.1 Mate privacy centered 1inux operating system you can download freely while also offering our users an optional 14+ advanced upgrade which comes with our Untracker and FAAST Boot along with one click popular privacy software installers like Tor and I2p, Wireshark and Bleachbit plus many more for a fair and reasonable price. Robolinux14.1-Mate is ideal for beginners and advanced users. We are proud that it comes with Enoch AI which is TOTALLY 100% PRIVATE, FREE, HONEST & UNCENSORED built into Robolinux Cinnamon 14.1 The Robolinux 14.1 version with rock solid Long Term Support through 2034! requires users to set secure boot in their BIOS. It is currently available in the Cinnamon desktop flavor. we will release series 14 Xfce version in the next two months.For more information please see Readme file. Warmest regards John Martinson Robolinux.org
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    Downloads: 121 This Week
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  • 25
    Cybera is an Internet cafe administration system. It works with prepaid cards or client accounts or in a post paid Self Service mode. Features include workstation control, user rights lockdown, accounting, stats and screen replication for CAI.
    Downloads: 91 This Week
    Last Update:
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