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GeezerVison is showing sourceforge.net — Best Open Source Server Operating Systems Software 2026

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Open Source Server Operating Systems Software

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Software for Server Operating Systems

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  • Our Free Plans just got better! | Auth0 Icon
    Our Free Plans just got better! | Auth0

    With up to 25k MAUs and unlimited Okta connections, our Free Plan lets you focus on what you do best—building great apps.

    You asked, we delivered! Auth0 is excited to expand our Free and Paid plans to include more options so you can focus on building, deploying, and scaling applications without having to worry about your security. Auth0 now, thank yourself later.
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  • 99.99% Uptime for MySQL and PostgreSQL Databases Icon
    99.99% Uptime for MySQL and PostgreSQL Databases

    Sub-second maintenance. 2x read/write performance. Built-in vector search for AI apps.

    Cloud SQL Enterprise Plus delivers near-zero downtime with 35 days of point-in-time recovery. Supports MySQL, PostgreSQL, and SQL Server.
    Start Free
  • 1
    KeePass

    KeePass

    A lightweight and easy-to-use password manager

    KeePass Password Safe is a free, open source, lightweight, and easy-to-use password manager for Windows, Linux and Mac OS X, with ports for Android, iPhone/iPad and other mobile devices. With so many passwords to remember and the need to vary passwords to protect your valuable data, it’s nice to have KeePass to manage your passwords in a secure way. KeePass puts all your passwords in a highly encrypted database and locks them with one master key or a key file. As a result, you only have to remember one single master password or select the key file to unlock the whole database. And the databases are encrypted using the best and most secure encryption algorithms currently known, AES and Twofish. See our features page for details.
    Leader badge
    4.9 out of 5 stars 609 Reviews
    Downloads: 771,253 This Week
    Last Update: 1 day ago
    See Project
  • 2
    TortoiseSVN

    TortoiseSVN

    An Apache SVN client, right where you need it most

    TortoiseSVN is a Subversion (SVN) client, implemented as a windows shell extension. Which means it's available right where you need it: in the Windows file explorer. It's intuitive and easy to use, since it doesn't require the Subversion command line client to run. Simply the coolest Interface to (Sub)Version Control!
    Leader badge
    4.8 out of 5 stars 155 Reviews
    Downloads: 666,733 This Week
    Last Update: 2026-11-04
    See Project
  • 3
    WinSCP

    WinSCP

    WinSCP is a free SFTP, SCP, S3, WebDAV, and FTP client for Windows.

    WinSCP is a popular free file manager for Windows supporting SFTP, FTP, FTPS, SCP, S3, WebDAV and local-to-local file transfers. A powerful tool to enhance your productivity with a user-friendly interface and automation options like .NET assembly or batch file scripting. Use WinSCP also for file editing, directory synchronization and site management. WinSCP is open-source and well documented. It is available in English and many other languages.
    Leader badge
    4.8 out of 5 stars 210 Reviews
    Downloads: 380,921 This Week
    Last Update: 18 hours ago
    See Project
  • 4

    Info-ZIP project

    Info-ZIP portable compression/archiver utilities

    Info-ZIP portable compression/archiver utilities (Zip, UnZip, WiZ, etc.)
    Leader badge
    5.0 out of 5 stars 17 Reviews
    Downloads: 109,589 This Week
    Last Update: 2026-07-31
    See Project
  • Endpoint Management with Remote Control Built In Icon
    Endpoint Management with Remote Control Built In

    Patch, monitor, and connect to Windows and macOS devices from one console

    Splashtop AEM handles patching, alerts, scripts, and inventory, and unattended remote control is included. When something needs hands-on work, you’re one click away instead of switching tools.
    Start Free Trial
  • 5
    GnuWin

    GnuWin

    Provides native Win32 open source ports and utilities

    GnuWin provides Win32-versions of GNU tools, or tools with a similar open source licence. The ports are native ports, relying only on libraries provided with any modern 32-bits MS-Windows operating system, such as 2000 / XP / Vista / 7
    Leader badge
    4.6 out of 5 stars 78 Reviews
    Downloads: 43,460 This Week
    Last Update: 2015-05-20
    See Project
  • 6
    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.
    Leader badge
    4.8 out of 5 stars 193 Reviews
    Downloads: 35,171 This Week
    Last Update: 2026-10-27
    See Project
  • 7
    Anti-Spam SMTP Proxy Server

    Anti-Spam SMTP Proxy Server

    Anti-Spam SMTP Proxy Server implements multiple spam filters

    The Anti-Spam SMTP Proxy (ASSP) Server project aims to create an open source platform-independent SMTP Proxy server which implements auto-whitelists, self learning Hidden-Markov-Model and/or Bayesian, Greylisting, DNSBL, DNSWL, URIBL, SPF, SRS, Backscatter, Virus scanning, attachment blocking, Senderbase and multiple other filter methods. Click 'Files' to download the professional version 2.8.1 build 24261. A linux(ubuntu 20.04 LTS) and a freeBSD 12.2 based ready to run OVA of ASSP V2 are also available for download. NOTICE: V1 development has been stopped at the end of 2014 (1.10.1 build 16060). Possibly there will be done some bugfixing in future. Please upgrade to V2, which is and will be actively maintained.
    Leader badge
    4.7 out of 5 stars 117 Reviews
    Downloads: 34,318 This Week
    Last Update: 2 days ago
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  • 8

    MinGW-w64 - for 32 and 64 bit Windows

    A complete runtime environment for gcc

    The mingw-w64 project is a complete runtime environment for gcc to support binaries native to Windows 64-bit and 32-bit operating systems.
    Leader badge
    4.2 out of 5 stars 112 Reviews
    Downloads: 33,646 This Week
    Last Update: 1 day ago
    See Project
  • 9

    S.M.A.R.T. Monitoring Tools

    Disk Inspection and Monitoring

    smartmontools contains utility programs (smartctl, smartd) to control/monitor storage systems using the Self-Monitoring, Analysis and Reporting Technology System (S.M.A.R.T.) built into most modern ATA and SCSI disks. It is derived from smartsuite.
    Leader badge
    4.4 out of 5 stars 38 Reviews
    Downloads: 24,726 This Week
    Last Update: 2026-09-09
    See Project
  • Paessler: Easy to Use With Enterprise Power. Free Trial Icon
    Paessler: Easy to Use With Enterprise Power. Free Trial

    A low-code dashboard makes monitoring intuitive for any admin, while scripting and custom sensors give experts full control.

    You shouldn't have to choose between a monitoring tool that's easy to use and one that's powerful enough for a complex environment. PRTG's low-code interface lets any admin build dashboards, set alerts and monitor devices without scripting, while custom sensors and full API access are there when your team needs deeper control. One platform, no compromise. Download a free 30-day trial now.
    Get Free Download
  • 10
    Scribus

    Scribus

    Powerful desktop publishing software

    Scribus is an Open Source program that brings professional page layout to Linux, BSD UNIX, Solaris, OpenIndiana, GNU/Hurd, Mac OS X, OS/2 Warp 4, eComStation, and Windows desktops with a combination of press-ready output and new approaches to page design. Underneath a modern and user-friendly interface, Scribus supports professional publishing features, such as color separations, CMYK and spot colors, ICC color management, and versatile PDF creation.
    Leader badge
    4.6 out of 5 stars 146 Reviews
    Downloads: 20,751 This Week
    Last Update: 3 days ago
    See Project
  • 11

    asio C++ library

    asio is a cross-platform C++ library for network and low-level I/O programming that provides developers with a consistent asynchronous model using a modern C++ approach.
    Leader badge
    5.0 out of 5 stars 6 Reviews
    Downloads: 23,057 This Week
    Last Update: 4 days ago
    See Project
  • 12

    AutoAP

    A script to find open Wi-Fi connections and the strongest signal

    AutoAP is a script that continuously scans for open Wi-Fi connections, tests them for validity, and connects to the strongest signal. If the connection is lost, the script scans again and finds the strongest valid signal again, and maintains a continuous connection to the internet in a mobile or portable environment. The script paremeters are highly configurable, including ability to configure secure connections. AutoAP is an add on to DD-WRT that allows routers to continuously scan for and connect to open (and predefined WEP) wireless networks. Ultimately the goal is to develop an easily deployable firmware that facilitates fast and easy mesh network creation. Typically, you would use this script on your router while in Repeater Mode, Client Mode, or Client-Bridged Mode.
    Leader badge
    4.7 out of 5 stars 19 Reviews
    Downloads: 19,416 This Week
    Last Update: 2015-08-06
    See Project
  • 13
    Free Pascal Compiler

    Free Pascal Compiler

    Free 32/64/16-bit multi-platform Pascal and Object Pascal compiler

    A 32/64/16-bit Pascal compiler for Win32/64/CE, Linux, Mac OS X/iOS, Android, FreeBSD, OS/2, Game Boy Advance, Nintendo NDS and DOS; semantically compatible with Delphi, Borland Pascal and Mac Pascal (partially) with extra features, e.g. operator overloading.
    Leader badge
    4.9 out of 5 stars 64 Reviews
    Downloads: 15,726 This Week
    Last Update: 2 days ago
    See Project
  • 14
    LIBPNG: PNG reference library

    LIBPNG: PNG reference library

    Reference library for supporting the Portable Network Graphics (PNG) format.
    Leader badge
    Downloads: 90,329 This Week
    Last Update: 12 hours ago
    See Project
  • 15
    System Informer

    System Informer

    View and manage processes, services and more with this powerful tool

    System Informer is a free and open source process viewer. This multi-purpose tool will assist you with debugging, malware detection and system monitoring.
    Leader badge
    5.0 out of 5 stars 7 Reviews
    Downloads: 17,495 This Week
    Last Update: 2026-10-08
    See Project
  • 16
    gnuplot

    gnuplot

    A portable, multi-platform, command-line driven graphing utility

    A famous scientific plotting package, features include 2D and 3D plotting, a huge number of output formats, interactive input or script-driven options, and a large set of scripted examples.
    Leader badge
    4.8 out of 5 stars 67 Reviews
    Downloads: 12,888 This Week
    Last Update: 2 days ago
    See Project
  • 17
    ClamWin

    ClamWin

    Antivirus software with virus scanning and virus definition updates

    Looking for free Open Source Antivirus for Windows? Download ClamWin Free Antivirus and get free virus scanning and free virus definition updates. Free Antivirus software for Windows, using the well-respected ClamAV scanning engine. Includes virus scanner, scheduler, virus database updates, context menu integration to MS Windows Explorer and Add-in to MS Outlook. Also features easy setup program.
    Leader badge
    4.5 out of 5 stars 151 Reviews
    Downloads: 8,617 This Week
    Last Update: 2022-01-06
    See Project
  • 18
    Pidgin IM

    Pidgin IM

    A universal instant messaging (IM) program

    See https://pidgin.im/about/ for more information. Pidgin is an instant messaging program which lets you log in to accounts on multiple chat networks simultaneously. It runs on Windows, Linux, and other UNIX operating systems. Pidgin is compatible with the following chat networks out of the box: AIM, ICQ, Google Talk, Jabber/XMPP, MSN Messenger, Yahoo!, Bonjour, Gadu-Gadu, IRC, MXit, Novell GroupWise Messenger, Lotus Sametime, SILC, SIMPLE, MySpaceIM, and Zephyr. It is written in C and makes heavy use of GLib and GTK+. Finch is a command line instant messaging program. It also lets you log in to accounts on multiple chat network simultaneously, and it is compatible with the same chat networks as Pidgin. It is written in C and makes heavy use of GLib and ncurses.
    Leader badge
    Downloads: 43,423 This Week
    Last Update: 2 days ago
    See Project
  • 19
    Moodle

    Moodle

    A free course management system (CMS) to create online learning sites

    Moodle is the world's most widely used open-source learning platform, trusted by educators and organisations worldwide to create flexible, accessible and engaging learning experiences. Moodle is free software, licensed under the GNU General Public License v3 (https://www.gnu.org/licenses/gpl-3.0.html). This SourceForge project is no longer maintained. The official Moodle LMS source code, releases and development live on GitHub. If you want to: * Download a packaged release: https://download.moodle.org/ * For up to date information about Moodle: http://moodle.org/ * Source Code: https://github.com/moodle/moodle
    Leader badge
    4.6 out of 5 stars 77 Reviews
    Downloads: 7,415 This Week
    Last Update: 2026-10-29
    See Project
  • 20
    Null-modem emulator

    Null-modem emulator

    The virtual serial port driver for Windows.

    The Null-modem emulator (com0com) is a kernel-mode virtual serial port driver for Windows. You can create an unlimited number of virtual COM port pairs and use any pair to connect one COM port based application to another. The HUB for communications (hub4com) allows to receive data and signals from one COM or TCP port, modify and send it to a number of other COM or TCP ports and vice versa.
    Leader badge
    4.4 out of 5 stars 64 Reviews
    Downloads: 6,705 This Week
    Last Update: 2018-04-09
    See Project
  • 21
    avidemux

    avidemux

    A free video editor to cut, filter, and encode projects

    Edit your avi, mpeg and nuv. Process audio and video. Cut.
    Leader badge
    4.2 out of 5 stars 65 Reviews
    Downloads: 6,026 This Week
    Last Update: 2022-09-19
    See Project
  • 22
    Dolibarr ERP - CRM

    Dolibarr ERP - CRM

    Open source ERP and CRM web software for business

    Dolibarr ERP - CRM is an easy to use ERP and CRM open source software package (run with a web php server or as standalone software) for businesses, foundations or freelancers (prospect, invoicing, inventory, warehouse, order, shipment, POS, members for foundations, bank accounts...). Dolibarr is also available with auto-installers for users with no technical knowledge to install Dolibarr and all its prerequisites (Apache, Mysql, PHP) with just one package. Available platforms for such packages are: Windows, Debian, Ubuntu, Mint, Redhat, Fedora, OpenSuse, Mandriva, Mageia. Other platform can use the generic distribution. This is a modular product, than can be enhanced with tons of external modules (to provide you features not available by default) from https://www.dolistore.com Download Dolibarr ERP - CRM here or sign up for 15-day free trial of the cloud-based application with free updates and support at one of the Cloud providers https://saas.dolibarr.org/
    Leader badge
    4.7 out of 5 stars 52 Reviews
    Downloads: 4,027 This Week
    Last Update: 19 hours ago
    See Project
  • 23
    VICE

    VICE

    Versatile Commodore Emulator

    VICE is an emulator collection which emulates the C64, the C64-DTV, the C128, the VIC20, practically all PET models, the PLUS4 and the CBM-II (aka C610). It runs on Unix, MS-DOS, Win32, OS/2, Acorn RISC OS, BeOS, QNX 6.x, Amiga, GP2X or Mac OS X machines.
    Leader badge
    4.7 out of 5 stars 48 Reviews
    Downloads: 3,799 This Week
    Last Update: 2 days ago
    See Project
  • 24
    Firebird

    Firebird

    A powerful, cross platform, SQL database system

    Firebird RDBMS offers ANSI SQL features & runs on Linux, Windows & several Unix platforms. Features excellent concurrency & performance & powerful stored procedure & trigger language. More information and downloads at https://firebirdsql.org/, issue tracker is https://github.com/FirebirdSQL/firebird/issues
    Leader badge
    4.9 out of 5 stars 90 Reviews
    Downloads: 3,171 This Week
    Last Update: 2026-04-17
    See Project
  • 25
    BeeBEEP (Free Office Messenger)

    BeeBEEP (Free Office Messenger)

    You can message and share files inside your intranet without a server.

    BeeBEEP is a free, open-source, peer-to-peer (P2P) desktop LAN chat and office messenger built with end-to-end encryption (Rijndael Algorithm, AES). Designed for local area networks, this free cross-platform messaging app enables instant messaging, group chat, and secure file sharing across your office, home, or intranet—completely serverless and offline. Whether you need a private LAN chat application for your team or a secure office communicator over VPN, BeeBEEP operates without central servers or cloud dependencies. It is a free, serverless chat solution for Windows, Linux, and macOS where privacy, data security, and local network communication are essential.
    Leader badge
    4.8 out of 5 stars 37 Reviews
    Downloads: 2,966 This Week
    Last Update: 2026-11-05
    See Project
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