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.

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    DACS - Distributed Access Control System

    Authentication, Access Control, and Single Sign-On

    DACS,a light-weight single sign-on and role-based security system for Apache or server-based software, provides comprehensive authentication capabilities, and powerful, transparent rule-based authorization checking for any web service or CGI program. The latest release is DACS 1.5.1 (26-Oct-2025) It is not available here! Get it at https://dacs.dss.ca/download.html
    Downloads: 0 This Week
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  • 2
    FunkOS is an RTOS for 8-32 bit MCUs including AVR, MSP430, and Cortex M3. Both C and C++ kernels avaiable. Key features include preemption, periodic events, device drivers, and mutex/semaphores. Includes a variety of graphics and filesystem middleware. Please also check out FunkOS's big brother, Mark3OS. Mark3OS is slightly larger, but is more scalable, much more feature-rich, and supports a wider variety of devices.
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    Downloads: 0 This Week
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