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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.

  • Gen AI apps are built with MongoDB Atlas Icon
    Gen AI apps are built with MongoDB Atlas

    The database for AI-powered applications.

    MongoDB Atlas is the developer-friendly database used to build, scale, and run gen AI and LLM-powered apps—without needing a separate vector database. Atlas offers built-in vector search, global availability across 115+ regions, and flexible document modeling. Start building AI apps faster, all in one place.
    Start Free
  • BrandMail Email Signatures for Outlook Icon
    BrandMail Email Signatures for Outlook

    Leverage every email as an opportunity to brand consistently and minimise the security risks associated with the tampering of HTML signatures.

    BrandMail®, developed by BrandQuantum, is a software solution that seamlessly integrates with Microsoft Outlook to empower every employee in the organisation to automatically create consistently branded emails via a single toolbar that provides access to brand standards and the latest pre-approved content.
    Learn More
  • 1
    NSIS: Nullsoft Scriptable Install System

    NSIS: Nullsoft Scriptable Install System

    Windows installer development tool

    NSIS (Nullsoft Scriptable Install System) is a professional open source system to create Windows installers. It is designed to be as small and flexible as possible and is therefore very suitable for internet distribution. Being a user's first experience with your product, a stable and reliable installer is an important component of succesful software. With NSIS you can create such installers that are capable of doing everything that is needed to setup your software. NSIS is script-based and allows you to create the logic to handle even the most complex installation tasks. Many plug-ins and scripts are already available: you can create web installers, communicate with Windows and other software components, install or update shared components and more.
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    Downloads: 9,740 This Week
    Last Update:
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  • 2
    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: 957 This Week
    Last Update:
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  • 3
    IPCop Firewall

    IPCop Firewall

    Linux firewall distribution geared towards home and SOHO users.

    The IPCop Firewall is a Linux firewall distribution. It is geared towards home and SOHO users. The IPCop web-interface is very user-friendly and makes usage easy.
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    Downloads: 99 This Week
    Last Update:
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  • 4
    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: 96 This Week
    Last Update:
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  • Save up to 90% off rates for USPS, UPS, DHL Express, and more with the best multi-carrier shipping software for e-commerce businesses. Icon
    Save up to 90% off rates for USPS, UPS, DHL Express, and more with the best multi-carrier shipping software for e-commerce businesses.

    For Small / Medium E-Commerce Businesses

    Whether you're established or just getting started, Shippo is the best shipping software for growing e-commerce brands that need to save time and money, fulfill and ship at scale, and delight customers. Create shipping labels for all carriers & save money with discounted rates. See all your online sales channels in one place and automatically access discounted USPS and DHL Express rates, or use your own carrier accounts. Sign up is free and there are no monthly fees or cancellation fees.
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  • 5
    Yabause
    Yabause is a portable Sega Saturn emulator.
    Downloads: 52 This Week
    Last Update:
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  • 6
    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.
    Downloads: 8 This Week
    Last Update:
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  • 7
    QmailAdmin is a web interface for managing email addresses in virtual domains created by Vpopmail.
    Downloads: 9 This Week
    Last Update:
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  • 8
    Unetbootinbitti

    Unetbootinbitti

    Tool for creating live usb-drives and downloading distros

    Tool for creating live usb-drives and downloading distros. This is an upgraded version of Unetbootin focusing on Bittix linux 9 and above and Linux Mint and Linux Mint debian. Has Distrowatch.com link etc.
    Downloads: 12 This Week
    Last Update:
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  • 9
    GOK is an on-screen keyboard. An alternative to the mouse/keyboard input system (for unix-like systems with GNOME libraries.)
    Downloads: 1 This Week
    Last Update:
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  • Managed Cybersecurity Platform Built for MSPs Icon
    Managed Cybersecurity Platform Built for MSPs

    Discover the cyber platform that secures and insures SMEs

    In a world that lives and breathes all things digital, every business is at risk. Cybersecurity has become a major problem for small and growing businesses due to limited budgets, resources, time, and training. Hackers are leveraging these vulnerabilities, and most of the existing cybersecurity solutions on the market are too cumbersome, too complicated, and far too costly.
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  • 10
    Dateshift is a small kernel module for Linux 2.2-2.6. It shifts time of preset list of process names, based on configuration file. Shift value is represented in seconds in absolute and relative forms. This module may be valuable for developers.
    Downloads: 0 This Week
    Last Update:
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  • 11
    GTCop Professional Security Appliance aims to provide a powerful tool for satellite communications, with enhanced QoS and bandwidth controls. As derived from IPCop Firewall, it is a stable, secure, easy to configure and maintain GNU/Linux firewall box.
    Downloads: 0 This Week
    Last Update:
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