Open Source C System Software for Windows

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

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  • 1
    VeraCrypt

    VeraCrypt

    Open source disk encryption with strong security for the Paranoid

    VeraCrypt is a free disk encryption software brought to you by IDRIX (https://www.idrix.fr) and based on TrueCrypt 7.1a. It adds enhanced security to the algorithms used for system and partitions encryption making it immune to new developments in brute-force attacks. It also solves many vulnerabilities and security issues found in TrueCrypt. This enhanced security adds some delay ONLY to the opening of encrypted partitions without any performance impact to the application use phase. This is acceptable to the legitimate owner but it makes it much harder for an attacker to gain access to the encrypted data. All released files are PGP signed with key ID=0x680D16DE, available on key servers and downloadable at https://www.idrix.fr/VeraCrypt/VeraCrypt_PGP_public_key.asc VeraCrypt can mount TrueCrypt volumes. It also can convert them to VeraCrypt format. Documentation: https://www.veracrypt.fr/en/Documentation.html FAQ : https://www.veracrypt.fr/en/FAQ.html
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    Downloads: 1,958 This Week
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  • 2

    UFTP

    Encrypted UDP based FTP with multicast

    UFTP is an encrypted multicast file transfer program, designed to securely, reliably, and efficiently transfer files to multiple receivers simultaneously. This is useful for distributing large files to a large number of receivers, and is especially useful for data distribution over a satellite link (with two way communication), where the inherent delay makes any TCP based communication highly inefficient. The multicast encryption scheme is based on TLS with extensions to allow multiple receivers to share a common key. UFTP also has the capability to communicate over disjoint networks separated by one or more firewalls (NAT traversal) and without full end-to-end multicast capability (multicast tunneling) through the use of a UFTP proxy server. These proxies also provide scalability by aggregating responses from a group of receivers.
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    Downloads: 1,118 This Week
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  • 3
    FreeRTOS Real Time Kernel (RTOS)

    FreeRTOS Real Time Kernel (RTOS)

    Market leading real time kernel for 40+ microcontroller architectures

    ************************************************************************************************************************ * The primary FreeRTOS repository is now in Git. Go to https://github.com/freertos for the latest FreeRTOS kernel and libraries. * Our support has moved to https://forums.freertos.org. ************************************************************************************************************************ FreeRTOS is a market-leading real-time operating system (RTOS) for microcontrollers and small microprocessors. Distributed freely under the MIT open source license, FreeRTOS includes a kernel and a growing set of libraries suitable for use across all industry sectors. Visit https://www.freertos.org for more information and other download options. Note about support/discussions forum: The FreeRTOS support forum has moved to https://forums.freertos.org. Please update your bookmarks and create new posts in the appropriate category in the new community forums.
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    Downloads: 309 This Week
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  • 4
    EchoLife ONT Tools Huawei

    EchoLife ONT Tools Huawei

    Software para cargar firmware de Routers modem HUAWEI

    Herramienta para cargar firmware a router modem de fibra HUAWEI Modelos admitidos: HG8145V5 - EG8145V5 - HG8245W5-6T y HG8245Q2
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    Downloads: 673 This Week
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  • 5
    vDos

    vDos

    Run DOS applications in Windows.

    vDos is specific to run serious (mainly text mode) DOS applications in Windows 32 or 64-bit, Windows 7 or later. You need at least already use such a DOS application to appreciate vDos. If you don’t, want to play with DOS (or its games): vDos isn’t meant for you! Recent versions (latest 2025.05.01) and the vDos forum are now hosted at: https://www.vdos.info
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    Downloads: 73 This Week
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  • 6
    QP Real-Time Event Frameworks & Tools

    QP Real-Time Event Frameworks & Tools

    Real-Time Event Frameworks based on active objects & state machines

    QP real-time event frameworks (RTEFs) provide lightweight, modern, event-driven architecture based on asynchronous Active Objects (Actors) and Hierarchical State Machines. The matching QM model-based design tool and other host-based tools complement the QP frameworks by supporting graphical modeling, code generation, software tracing, and unit testing for event-driven embedded software. Visit https://www.state-machine.com for more information. The QP RTEFs can run on bare-metal microcontrollers, replacing a traditional RTOS. The frameworks contain a selection of built-in real-time kernels (RTOS kernels), such as the cooperative QV kernel, the preemptive non-blocking QK kernel, and the unique preemptive, dual-mode (blocking/non-blocking) QXK kernel. Native QP ports and ready-to-use examples are provided for ARM Cortex-M (M0/M0+/M3/M4/M7/M33/...) as well as other CPUs. The QP RTEFs can also work with many traditional RTOSes and General-Purpose OSes, such as Linux and Windows.
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    Downloads: 64 This Week
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  • 7
    NebiOS Alternative Mirror (Official)

    NebiOS Alternative Mirror (Official)

    An Ubuntu Linux-based OS that aims to end user.

    NebiOS is Ubuntu-based secure, privacy-focused universal OS for daily life, creativity, gaming & more. Official mirror - use if main site has download issues. Main site: https://nebios.org ⚠️ DON'T DOWNLOAD FROM UNKNOWN SOURCES! 🛡️ Privacy: NebiOS has no telemetry, no background data services, no tracking daemons, and cannot send any personal data without user action. Full policy: nebisoftware.com/legal/privacy.html === 🚀 NebiOS X out now! ⚠️ Note on Virtual Machines: NebiOS X is optimized and designed for real hardware performance and native GPU acceleration. Virtualization platforms (VMware, VirtualBox, GNOME Boxes, etc.) may show degraded graphics or system performance. For accurate testing, please install NebiOS X on physical hardware. === System Requirements and informations about before installation can be found at https://nebios.org/download (select your version for it)
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    Downloads: 53 This Week
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  • 8
    M+GUI - A Qt implementation of MameUI
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    Downloads: 93 This Week
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  • 9

    Core13

    Arduino core for Attiny13

    An Arduino core for the Attiny13 processors designed with small size in mind. *Support*: http://arduino.cc/forum/index.php/topic,89781.0.html Currently supported functions: * = Partial support map() random() randomSeed() millis() micros() delay() delayMicroseconds() * analogRead() analogWrite() pinMode() digitalRead() digitalWrite() pulseIn() (Untested) shiftIn() (Untested) shiftOut() (Untested) If you find any issues be sure to make sure you are using the latest version first.
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    Downloads: 24 This Week
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  • 10

    ISAM File handler

    ISAM file handler compatible with the leading commercial ISAM

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    Downloads: 20 This Week
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  • 11
    Expand a TrueCrypt volume on the fly without reformatting. All kind of volumes (container files, disks and partitions) formatted with the NTFS file system are supported.
    Downloads: 12 This Week
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  • 12
    ngrep strives to provide most of GNU grep's common features,applying them to the network layer. ngrep is a pcap-aware tool that will allow you to specify extended regular expressions to match against data payloads of packets. SUPPORT/REPORTING BUGS: please use https://github.com/jpr5/ngrep/issues Thank you!
    Downloads: 14 This Week
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  • 13
    DOS/32 Advanced DOS Extender is a drop-in replacement for the DOS/4GW DOS Extender and compatibles. Being fast, small and flexible DOS/32A can be used in many environments, from embedded systems to DOS emulators, by both developers and end users alike.
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    Downloads: 38 This Week
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  • 14
    VeraWipe

    VeraWipe

    Secure Disk Wipe

    A secure disk wipe tool based on VeraCrypt encryption engine. Release archives are signed using PGP key with fingerprint 607E5A7AD030D38E5E5C2CA502C30AE90FAE4A6F belonging to Mounir IDRASSI and which can be found on major key servers (e.g.. https://keys.openpgp.org/vks/v1/by-fingerprint/607E5A7AD030D38E5E5C2CA502C30AE90FAE4A6F).
    Downloads: 19 This Week
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  • 15
    Full Stack Computer Scanner

    Full Stack Computer Scanner

    Scans the entire computer device stack (hardware, software, comms)

    The Full Stack Computer Scanner is a read-only Windows freeware security diagnostics app for computer platform awareness. No ads. No accounts. No data collection. Fully offline. Complements AVs by scanning for hardware, software, network integrity, and dangerous malware signatures. Only binaries from this official SourceForge project page are legitimate. Other hosting, web, cloud, virtualization, or “run online” instances are unauthorized. Trust your vendors but verify with the Full Stack Computer Scanner. Keith Johnson | KCJ Tech Solutions | 30 Years of IT Experience Not sure whether your computer is secure? Contact: fullstackcomputerscanner@gmail.com. Optional 20-Minute Computer Health Check: $40 USD. Optional Computer Health Check + Written Report: $80 USD. Practical next steps. No remote access. Chat/conversation only. For Individuals 21+. Project donations welcome. Thank you in advance. bc1qz259yr4q89r0669zm9mrvs2trkyw0z4kazzx0n
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    Downloads: 8 This Week
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  • 16
    JauntePE
    Windows portable app maker: launcher(s), runtime, and gui designed to help you run non-portable applications in a portable manner.
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    Downloads: 29 This Week
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  • 17

    QToaster

    A simple and fast frontend for the QEMU Emulator - Freeware.

    QToaster is a simple app that executes QEMU with proper command line parameters (a frontend). The features are pretty basic, the executable is small and is a portable application. I needed something to automate QEMU quickly operate fast without having to worry about setting things up. I just wanted to get moving fast. It is designed just for that. It will keep your last machine settings and reload them from the .ini files that it creates. The main purpose I needed this for is Android - using Limbo. If something works on QEMU then it has a good chance of working on Android. You don't need to put QEMU in your environment path, just point to its base folder. It doesn't need any special runtimes (java, .net, Python, etc.), it only needs the utility file Lutil.dll. Frontend was made for: http://69.170.215.148/nothoro/software/QTPage/QToaster.html QEMU emulator version 6.0.0-rc2 available at: https://qemu.weilnetz.de/w64/2021/ When you run the installer, it will extract to a subfld
    Downloads: 16 This Week
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  • 18
    TaskSwitchXP provides the same functionality as the existing application switching mechanism in Windows XP today. In addition to displaying an icon list, however, the application will also show a thumbnail preview of the window that will be switched to.
    Downloads: 8 This Week
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  • 19
    SOEM is an open source EtherCAT master library written in c. Its primary target is Linux but can be adapted to other OS and embedded systems.
    Downloads: 3 This Week
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  • 20
    Development of a driver and utilities to use 3Com ADSL Modem USB at Linux and Windows operating systems. Desarrollo de un driver y utilidades para utilizar el 3Com ADSL Modem USB en los sistemas operativos Linux y Windows.
    Downloads: 7 This Week
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  • 21
    Verigio - Multi Port Forwarder

    Verigio - Multi Port Forwarder

    Simple software for port forwarding and routing w/o a hardware router

    A multi functional tool for port forwarding offers a full matrix of capabilities for selecting network traffic by interface,MAC,IP,TCP,UDP and forwarding it to another interface,MAC,IP,TCP,UDP. Flexible rules allow to change specific attributes of the traffic leaving the rest intact. The port forwarding rules can be imported/exported into XML files. Vivid user interface indicates in real time which rules are triggered by the traffic. The program has its own proprietary traffic management engine (network device driver) which does not make changes to the operating system, instead it simply filters the traffic. Hence, it can work side-by-side with lots of other network and security software.
    Downloads: 7 This Week
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  • 22
    RKH - State Machine Framework

    RKH - State Machine Framework

    State machine framework for reactive embedded systems

    RKH is a generic, flexible, modular, highly portable, ANSI-C compliant, and open-source development tool for implementing hierarchical state machines based on modern state machine concepts. This modern techniques are used to give an abstract description of the dynamic behavior of a system in a substantial manner. The RKH not implements neither entire UML specs. nor entire Statechart specs. Instead, the RKH intention is to support just enough basic concepts of that powerful tools to facilitate the reactive-system modeling holding a solid, and efficient implementation. Broadly speaking, the RKH implementation has been designed from the ground up to be used in 8-bits platforms but can be easily adapted to 16 or 32-bits platforms.
    Downloads: 2 This Week
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  • 23
    WiKID Two-Factor Authentication System

    WiKID Two-Factor Authentication System

    Two-factor authentication system

    The WiKID Strong Authentication System is a public-key based two-factor authentication system. It is a flexible, extensible, and secure alternative to tokens, certs and passwords. Application & API support exists for Java, ASP, PHP, Ruby, OpenVPN, TACACS+, etc. Read our eGuide on how to setup your network with two-factor authentication: http://www.wikidsystems.com/learn-more/two-factor-authentication-white-papers
    Downloads: 2 This Week
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  • 24

    WinLynx

    A Linux Operating System based off of openSUSE

    WinLynx is a simple-to-use Linux Operating system based off of openSUSE. Using the KDE4 Desktop Environment makes the GUI look sharp and modern. WinLynx packages, LibreOffice, Mozilla FireFox, and much, much more.... NOTE: WinLynx comes with a default user which is "root". We RECOMMEND creating a new user for personal use. If, you want to use the default "root" user, the password is "linux"
    Downloads: 4 This Week
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  • 25
    wolfSSL
    The wolfSSL embedded SSL library (formerly CyaSSL) is a lightweight, portable, C-language-based SSL/TLS library targeted at IoT, embedded, and RTOS environments primarily because of its size, speed, and feature set. It works seamlessly in desktop, enterprise, and cloud environments as well. wolfSSL supports industry standards up to the current TLS 1.2 and DTLS 1.2, is up to 20 times smaller than OpenSSL, offers a simple API, an OpenSSL compatibility layer, OCSP and CRL support, is backed by the robust wolfCrypt cryptography library, and much more. wolfSSL relies on the FIPS 140-2 validated wolfCrypt library for all cryptographic functionality. Visit http://wolfssl.com/wolfSSL/fips.html for more info!
    Downloads: 4 This Week
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