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

  • 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.
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  • Custom VMs From 1 to 96 vCPUs With 99.95% Uptime Icon
    Custom VMs From 1 to 96 vCPUs With 99.95% Uptime

    General-purpose, compute-optimized, or GPU/TPU-accelerated. Built to your exact specs.

    Live migration and automatic failover keep workloads online through maintenance. One free e2-micro VM every month.
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  • 1
    An extremly fast and lightweight file manager which features tabbed browsing and user-friendly interface
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    Downloads: 907 This Week
    Last Update:
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  • 2
    Wine

    Wine

    Run Windows applications on Linux, BSD, Solaris, and Mac OS X

    Wine is an Open Source implementation of the Windows API on top of X and Unix. Wine provides both a development toolkit for porting Windows sources to Unix and a program loader, allowing many unmodified Windows binaries to run on x86-based Unixes.
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    Downloads: 714 This Week
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  • 3
    uGet - Download Manager
    uGet, the Best Download Manager for Linux. uGet is a lightweight yet powerful Open Source download manager for GNU/Linux developed with GTK+, which also comes packaged as a portable Windows app. - Quick Links - Features: https://ugetdm.com/features Screenshots: https://ugetdm.com/screenshots Blog: https://ugetdm.com/blog Support: https://ugetdm.com/qa Frequently Asked Questions (FAQs): https://ugetdm.com/qa/faq RSS Feed: https://ugetdm.com/rss GitHub: https://github.com/ugetdm
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    Downloads: 423 This Week
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  • 4
    Xming X Server for Windows

    Xming X Server for Windows

    X Window System Server for Windows

    Xming is the leading X Window System Server for Microsoft Windows 8/7/Vista/XP (+ server 2012/2008/2003). It is fully featured, small and fast, simple to install and because it is standalone native Microsoft Windows, easily made portable (not needing a machine-specific installation).
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    Downloads: 2,360 This Week
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  • 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.
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  • 5
    FreeRDP

    FreeRDP

    FreeRDP is a free remote desktop protocol library and clients

    FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. Enjoy the freedom of using your software wherever you want, the way you want it, in a world where interoperability can finally liberate your computing experience. The nightly builds are installed into /opt/freerdp-nightly and can be installed in parallel with the distributions regular freerdp package. Network tracing of RDP can be quite a challenge due to a number of factors such as encryption, compression, and the fact that these protocol features cannot always be disabled or worked around. One of the easiest way of decrypting RDP traffic is to configure the server with a self-signed certificate for which the private key is known, and then use this certificate with a network tracing tool to automatically decrypt the packets.
    Downloads: 84 This Week
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  • 6
    Environment Modules

    Environment Modules

    Manage your shell environment variables and aliases

    The environment modules package provides for an easy dynamic modification of a user's environment via modulefiles. which typically instruct the module command to alter or set shell environment variables such as PATH, MANPATH, etc. as well as define aliases over a variety of shells.
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    Downloads: 470 This Week
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  • 7
    Contiki is an open source, highly portable, networked, multi-tasking operating system for memory-constrained systems. Contiki current source code: https://github.com/contiki-os/contiki Contiki historical source code: https://github.com/adamdunkels/contiki-1.x
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    Downloads: 322 This Week
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  • 8
    Ultimate Edition

    Ultimate Edition

    An Ubuntu remix for both new and experienced Linux sophisticates

    Ultimate Edition Linux, previously "Ubuntu Ultimate Edition". We cater to a large base of *nix users including, but certainly not limited to gamers & low resource computers. We have a Ultimate Edition for virtually any user.
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    Downloads: 325 This Week
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  • 9
    Cntlm is an NTLM / NTLMv2 authenticating HTTP/1.1 proxy. It caches auth'd connections for reuse, offers TCP/IP tunneling (port forwarding) thru parent proxy and much much more. It's in C, very fast and resource-efficient. Go to http://cntlm.sf.net/
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    Downloads: 251 This Week
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  • Build Agents and Models on One Platform Icon
    Build Agents and Models on One Platform

    Everything you need to build production-ready agents and models. Access 200+ Google and third-party AI models and tools.

    Gemini Enterprise Agent Platform is Google Cloud's comprehensive platform for developers to build, scale, govern, and optimize agents and models. Choose from Google's most advanced models and third-party models like Anthropic's Claude Model Family.
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  • 10
    Display Power Off Utility
    Display power off utility. Powers off desktop/notebook display and optionally locks workstation. Can be set as a screensaver. Can be launched as a system tray icon application.
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    Downloads: 220 This Week
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  • 11
    FlickOS

    FlickOS

    FlickOS is a lightweight Linux desktop based on Debian 13 with a labwc

    FlickOS 2.1 is a lightweight Linux desktop based on Debian 13 (trixie) with a labwc Wayland session. It ships as a live ISO with the Calamares installer. One hybrid ISO boots BIOS and UEFI and can be written to USB. 64-bit only. Three layouts switch live: Redmond (default, one bottom panel), Cupertino (top bar and dock), and Traditional (top panel and window list). Arc-Dark by default, with a Light desktop style. Optional tiling is off by default (Super+T). Installed systems get a graphical login; the live session logs in automatically. Includes Firefox ESR, LibreOffice, VLC, Bluetooth, printing, Flatpak, PipeWire and NetworkManager. Firewall on (incoming blocked), automatic security updates, and FlickOS desktop updates via apt. No in-place upgrade from FlickOS 1.x (Ubuntu 20.04 / LXLE). Back up and install 2.1 fresh. Source: https://github.com/dvbondoy/FlickOS Discord: https://discord.gg/xmpqbdfep Community: https://www.reddit.com/r/flickos/ License: GPL-3
    Downloads: 290 This Week
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  • 12
    Tools and plugins related to bart's PEBuilder
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    Downloads: 145 This Week
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  • 13
    Florence

    Florence

    On-screen virtual keyboard

    Florence is an extensible scalable on-screen virtual keyboard for GNOME that stays out of your way when not needed. You need it if you can't use a real keyboard either because of a handicap, broken keyboard or tablet PC but you can use a pointing devide.
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    Downloads: 74 This Week
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  • 14
    Rofi

    Rofi

    A window switcher, application launcher and dmenu replacement

    Rofi started as a clone of the simple switcher, written by Sean Pringle - a popup window switcher roughly based on a super switcher. Simpleswitcher laid the foundations, and therefore Sean Pringle deserves most of the credit for this tool. Rofi (renamed, as it lost the simple property) has been extended with extra features, like an application launcher and ssh-launcher, and can act as a drop-in menu replacement, making it a very versatile tool. Rofi, like dmenu, will provide the user with a textual list of options where one or more can be selected. This can either be running an application, selecting a window, or options provided by an external script. It's not an application that can support every possible use case. It tries to be generic enough to be usable by everybody. Rofi has several built-in modes implementing common use cases and can be extended by scripts (either called from Rofi or calling Rofi) or plugins.
    Downloads: 8 This Week
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  • 15
    The ROX Desktop is a desktop based around ROX-Filer - a powerful file manager.
    Downloads: 47 This Week
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  • 16
    Parcellite is a lightweight GTK+ clipboard manager. This is a stripped down, basic-features-only clipboard manager with a small memory footprint for those who like simplicity.
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    Downloads: 19 This Week
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  • 17
    Use Wine (Wine Is Not an Emulator) to run Windows applications on Darwin and Mac OS X.
    Downloads: 11 This Week
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  • 18

    recaps

    Switch Windows input language using any key.

    Easy to use Windows keyboard layouts switcher.
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    Downloads: 21 This Week
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  • 19
    Syllable Desktop is a complete operating system that is easy to use, powerful, lightweight and extraordinarily fast and responsive. It has its own kernel, filesystem, GUI and applications. Syllable Server is a matching small and efficient Linux server.
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    Downloads: 13 This Week
    Last Update:
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  • 20
    Broken down into the file manager (ego) and the virtual filesystem (libferris/ferrisui). the VFS libferris is the core of the project, ego uses GTK+2 and gevas to present info from libferris and allow management using gfmv, gfcp, gfrm etc and file clip
    Downloads: 54 This Week
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  • 21
    Blackbox for Windows is an alternative shell for Microsoft Windows. It is based stylistically on the Blackbox window manager for the X Window System, however it does not use the same codebase except for the gradient rendering code.
    Downloads: 14 This Week
    Last Update:
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  • 22
    KeyTouch makes it possible to easily configure the extra function keys (like multimedia keys) of your keyboard. You can define which program will be executed while pressing a key. KeyTouch 2 is the first program of its kind that works on kernel 2.6.
    Downloads: 14 This Week
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  • 23
    Net Activity Viewer

    Net Activity Viewer

    Graphical network connections viewer for Linux

    Netactview is a graphical network connections viewer similar in functionality with netstat. It includes features like process information, host name retrieval, automatic refresh, sorting, filtering and csv save.
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    Downloads: 13 This Week
    Last Update:
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  • 24
    Conky is an advanced, highly configurable system monitor for X based on torsmo. Development has moved to GitHub at https://github.com/brndnmtthws/conky
    Downloads: 7 This Week
    Last Update:
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  • 25
    Wcd is another Norton Change Directory (NCD) clone. Wcd is a command-line program to change directory fast. It includes a full screen interactive directory tree browser with speed search and a fast way to choose between multiple matches.
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    Downloads: 20 This Week
    Last Update:
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