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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.

  • MongoDB Atlas runs apps anywhere Icon
    MongoDB Atlas runs apps anywhere

    Deploy in 115+ regions with the modern database for every enterprise.

    MongoDB Atlas gives you the freedom to build and run modern applications anywhere—across AWS, Azure, and Google Cloud. With global availability in over 115 regions, Atlas lets you deploy close to your users, meet compliance needs, and scale with confidence across any geography.
    Start Free
  • The top-rated AI recruiting platform for faster, smarter hiring. Icon
    The top-rated AI recruiting platform for faster, smarter hiring.

    Humanly is an AI recruiting platform that automates candidate conversations, screening, and scheduling.

    Humanly is an AI-first recruiting platform that helps talent teams hire in days, not months—without adding headcount. Our intuitive CRM pairs with powerful agentic AI to engage and screen every candidate instantly, surfacing top talent fast. Built on insights from over 4 million candidate interactions, Humanly delivers speed, structure, and consistency at scale—engaging 100% of interested candidates and driving pipeline growth through targeted outreach and smart re-engagement. We integrate seamlessly with all major ATSs to reduce manual work, improve data flow, and enhance recruiter efficiency and candidate experience. Independent audits ensure our AI remains fair and bias-free, so you can hire confidently.
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  • 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
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  • 2
    deepin
    deepin is a Debian-based distribution that aims to provide an elegant, user-friendly and reliable operating system. It does not only include the best the open source world has to offer, but it has also created its own desktop environment called DDE or Deepin Desktop Environment which is based on the Qt 5 toolkit. Deepin focuses much of its attention on intuitive design. Its home-grown applications, like Deepin Software Centre, DMusic and DPlayer are tailored to the average user. Being easy to install and use, deepin can be a good Windows alternative for office and home use.
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    Downloads: 3,228 This Week
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  • 3
    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
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  • 4
    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: 718 This Week
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  • Enterprise Job Scheduling Software Icon
    Enterprise Job Scheduling Software

    Unify Enterprise Job Scheduling for Scale, Visibility, and Control

    Managing your sprawling data center and cloud with disparate native schedulers creates chaos. Achieve unparalleled control and efficiency over your entire IT environment with JAMS job orchestration tools. JAMS provides the singular, centralized platform required to overcome the complexities of disparate native schedulers. Automate, secure, and govern all your workloads, eliminating fragmented control, compliance risks, and operational bottlenecks. JAMS streamlines operations and ensures audit-ready history, transforming your enterprise automation with confidence and precision.
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  • 5
    Stacer

    Stacer

    Linux System Optimizer and Monitoring

    Linux System Optimizer and Monitoring Github Repository: https://github.com/oguzhaninan/Stacer
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    Downloads: 471 This Week
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  • 6
    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
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  • 7
    Octavi-OS

    Octavi-OS

    fast mirror online soon

    An AOSP based custom rom with new look and feel and massive customisations , contains everything you need .
    Downloads: 115 This Week
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  • 8
    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
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  • 9
    PCSX2

    PCSX2

    PlayStation 2 emulator for Windows and Linux

    PCSX2 is a PlayStation 2 emulator for Windows and Linux, started by the same team that brought you PCSX (a Sony PlayStation 1 emulator). Currently, it can emulate thousands of games at full speed
    Downloads: 92 This Week
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  • Gearset | The complete Salesforce DevOps solution Icon
    Gearset | The complete Salesforce DevOps solution

    Salesforce DevOps done right.

    Gearset is the only platform you need for unparalleled deployment success, continuous delivery, automated testing and backups.
    Learn More
  • 10
    AI File Sorter

    AI File Sorter

    Local AI file organization with categorization and rename suggestions

    AI File Sorter is a cross-platform desktop application that uses AI to organize files and suggest meaningful file names based on real content, not just filenames or extensions. The app can analyze image files locally and propose human-readable rename suggestions (for example, IMG_2048.jpg → clouds_over_lake.jpg). It can also analyze the text content of documents to improve categorization and renaming. Supported formats include PDF, DOCX, XLSX, PPTX, ODT, ODS, ODP, and common text files. All suggestions are optional and must be reviewed before being applied. AI File Sorter helps clean up cluttered folders such as Downloads, external drives, or NAS storage. It can run fully offline using local AI models like Mistral 7B or LLaMA 3B. No files, images, document contents, or metadata are uploaded, and no telemetry is sent unless a remote AI endpoint is explicitly configured.
    Downloads: 231 This Week
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  • 11
    SulinOS

    SulinOS

    Indipendent distro uses inary package system. Sulin is roolling donkey

    Sulin is rolling donkey Gitlab: https://gitlab.com/sulinos Github: https://github.com/sulinos Telegram: https://t.me/sulinos powered by donkey team
    Downloads: 56 This Week
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  • 12
    Cinemagoer

    Cinemagoer

    Python package to retrieve and manage data of the IMDb

    Cinemagoer is a Python package useful to retrieve and manage the data of the IMDb movie database about movies, people, characters and companies. Platform-independent, it can retrieve data from both the IMDb's web server and a local copy of the whole db.
    Downloads: 13 This Week
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  • 13
    BEE free TECH

    BEE free TECH

    [ Beautiful, Effective, Efficient, Freedom, Technology ]

    BEE free 20.04 is a community-driven Linux distribution based on Ubuntu 20.04 .
    Downloads: 14 This Week
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  • 14
    Partition Logic

    Partition Logic

    Disk partitioning and data management for x86-compatible systems

    Based on the Visopsys operating system, Partition Logic is a bootable disk image featuring a disk manager program that can create, delete, erase, format, defragment, resize, copy, and move partitions and modify their attributes. It can copy entire hard disks from one to another. Other tools, such as system diagnostics, are also available within the system.
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    Downloads: 37 This Week
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  • 15
    QmailAdmin is a web interface for managing email addresses in virtual domains created by Vpopmail.
    Downloads: 9 This Week
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  • 16
    Provides battery,temperature,ac,cpufreq (SpeedStep,Powernow!) control and monitoring. Proper suspend to disk/ram and standby by shell hooks that are easy to extend. APM and ACPI machines are supported equally. For laptops as well as for workstations.
    Downloads: 30 This Week
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  • 17
    THIS PROJECT HAS BEEN ABANDONED SINCE 2007, NO SUPPORT WILL BE PROVIDED. Winpooch is a watchdog for Windows (2000, XP, 2003, but only 32-bits). It detects modifications in your system, so as to detect a trojan or a spyware installation. It also includes a real-time anti-virus. Set your own security level for anti-spyware, ant
    Downloads: 7 This Week
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  • 18
    Yammy (Yahoo Messenger Archive Decoder) allows you to decode and view not only yours but, also other stored YM conversations. You don't even need a password!
    Downloads: 15 This Week
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  • 19
    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
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  • 20
    Visopsys

    Visopsys

    Alternative operating system for x86 computers

    Visopsys is an alternative operating system for PC compatible computers. In development since 1997, this system is small, fast, and open source. It features a simple but functional graphical interface, pre-emptive multitasking, and virtual memory. Though it attempts to be compatible in a number of ways, Visopsys is not a clone of any other operating system. You can demo the distribution from a “live” CD/DVD or floppy disk
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    Downloads: 6 This Week
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  • 21
    Tool to inspect the used space of folders. Files are displayed in a cushioned tree map. Useful if you wonder where all your free space went to.
    Downloads: 5 This Week
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  • 22
    SeMA architecture is a protocol stack operating for Adhoc Networks at three interacting layers to accommodate access to general purpose network applications such as printing, file transfer and so on in a highly mobile environment.SeMA architecture has be
    Downloads: 5 This Week
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  • 23
    ispCP is a project founded to build a Multi Server Control and Administration Panel without limits. This Control Panel should be usable by any Internet Service Provider (ISP). This project is a fork of the stalled VHCS.
    Downloads: 1 This Week
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  • 24
    USSU Unlimited

    USSU Unlimited

    Unattended System Software Updater Unlimited

    USSU Unlimited helps you to manage and keep your standard Windows applications up-to-date. It gives the possibility to add applications yourself. Use it to upgrade already installed applications, it highlights outdated or missing applications and advises to download and install them in a single step. It takes away those frustrations to update everything manually. Instead it leafs your with a updated computer and a smile! Currently 45 standard applications are supported. more supported applications will be available soon... Windows network deployment/management will be available Q3 2013. Supported on Windows XP, Vista, 7, 8 and 2008R2.
    Downloads: 1 This Week
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  • 25
    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
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