Open Source C Software - Page 69
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C Software
Browse free open source C Software and projects below. Use the toggles on the left to filter open source C Software by OS, license, language, programming language, and project status.
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Xdvi is a program for displaying DVI files on the X window system. Xdvik is a variant with hyperlink support and other additions, deployed e.g. in the TeX Live distribution.
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3ds-examples
Examples for 3DS using devkitARM, libctru, citro3d and citro2d
Examples for 3DS using devkitARM, libctru, citro3d and citro2d. -
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Acl
A powerful server and network library, including coroutine
The Acl (Advanced C/C++ Library) project a is powerful multi-platform network communication library and service framework, supporting LINUX, WIN32, Solaris, FreeBSD, MacOS, AndroidOS, iOS. Many applications written by Acl run on these devices with Linux, Windows, iPhone and Android and serve billions of users. There are some important modules in Acl project, including network communcation, server framework, application protocols, multiple coders, etc. The common protocols such as HTTP/SMTP/ICMP//MQTT/Redis/Memcached/Beanstalk/Handler Socket are implemented in Acl, and the codec library such as XML/JSON/MIME/BASE64/UUCODE/QPCODE/RFC2047/RFC1035, etc., are also included in Acl. Acl also provides a unified abstract interface for popular databases such as Mysql, Postgresql, Sqlite. Using Acl library users can write database applications more easily, quickly and safely. -
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Apple CUPS
Apple CUPS Sources
CUPS is the widely used printing system for UNIX-like operating systems that presents a modern, network-centric print stack built around IPP. It includes the scheduler (the print server), filters, backends, and PPD/driver plumbing needed to accept jobs, determine capabilities, rasterize or convert, and deliver output to devices over local and network transports. Its modular pipeline lets administrators and vendors plug in drivers or filter chains while retaining a consistent user-facing interface across platforms. Client tools and libraries provide command-line and programmatic access for queue management, job submission, and printer discovery. Over time CUPS has aligned closely with driverless printing via IPP-Everywhere/AirPrint-style capability exchange, reducing the need for vendor-specific drivers on many devices. The project’s reference implementation is battle-tested across desktops, servers, and embedded systems that expose print services to a network. -
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BTLE
Bluetooth Low Energy (BLE) packet sniffer and transmitter
BTLE is a free and open-source Software Defined Radio Bluetooth Low Energy (BLE) software suite. BLE sniffer. Besides sniff broadcasting/fixed channels, it can also track channel hopping of a communication link. Universal BLE packet transmitter. Besides BLE standard, it supports also raw bit mode to generate arbitrary GFSK packets. In this way, you can test non-standard protocols or standards under discussion before chipping in the market. -
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BoringSSL
Mirror of BoringSSL
BoringSSL is a Google-maintained fork of OpenSSL, designed specifically to meet the security, performance, and maintainability needs of Google’s infrastructure and products. While fully open source, BoringSSL is not intended for general public use — it serves as a streamlined, heavily modified SSL/TLS and cryptography library optimized for Google’s internal ecosystem, including Chrome/Chromium, Android, and other Google services. The project prioritizes security, simplicity, and maintainability over backward compatibility. Unlike OpenSSL, BoringSSL provides no guarantee of stable APIs or ABIs, meaning third-party projects depending on it may frequently break. Google products that use BoringSSL ship their own copies and update them as needed, enabling faster iteration without legacy constraints. BoringSSL includes comprehensive API documentation, build instructions, and guidance for porting code from OpenSSL. -
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CPU Features
A cross platform C99 library to get cpu features at runtime
cpu_features is a cross-platform C library developed by Google that provides a simple and efficient way to detect available CPU features at runtime across a wide range of architectures and operating systems. It enables applications to determine which instruction sets (such as SSE, AVX, or NEON) are supported on the host machine, allowing developers to optimize performance dynamically. The library supports numerous architectures—including x86, ARM, AArch64, MIPS, POWER, RISCV, LoongArch, and s390x—and works on major operating systems like Linux, macOS, Windows, FreeBSD, Android, and iOS. Implemented in portable C99, it is thread-safe, has no memory allocations, and raises no exceptions, making it suitable even for use in low-level system libraries. The design emphasizes portability, extensibility, and compatibility with sandboxed or restricted environments where direct CPU access may be limited. -
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CPUMiner-Multi
Multi-algo CPUMiner & Reference Cryptonote Miner (JSON-RPC 2.0)
This is a multi-threaded CPU miner, fork of pooler's cpuminer. Multi-algo CPUMiner & Reference Cryptonote Miner (JSON-RPC 2.0). -
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CSAPP-Labs
Solutions and Notes for Labs of Computer Systems
CSAPP-Labs is a repository that organizes and provides practical lab exercises corresponding to the famous textbook Computer Systems: A Programmer’s Perspective (CS:APP), helping students deepen their understanding of how computer systems work at the machine level. The exercises cover core topics such as data representation, assembly language, processor architecture, cache behavior, memory hierarchy, linking, and concurrency, contextualizing abstract concepts from the book in real code and experiments. Each lab is structured to include test programs, Makefiles, harnesses, and step-by-step instructions that guide students through hands-on interaction with low-level programming and system behavior. By actually building and debugging code that runs close to hardware, learners acquire intuition about performance trade-offs, bit-level manipulation, stack frame layout, and how compilers and OS features influence execution. -
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Cagebreak
A Wayland Tiling Compositor Inspired by Ratpoison
Cagebreak is a Wayland tiling compositor based on Cage and inspired by Ratpoison. This project provides a successor to Ratpoison for Wayland. However, this is no reimplementation of Ratpoison. Cagebreak supports Arch Linux and uses the libraries and versions from extra and core at the time of release. Most other setups work with a bit of luck. You can build Cagebreak with the meson build system. It requires Wayland, wlroots and xkbcommon to be installed. Note that Cagebreak is developed against the latest tag of wlroots, in order not to constantly chase breaking changes as soon as they occur. Cagebreak is keyboard-based. Everything regarding cagebreak can be done through the keyboard and it is our view that it should be. This does not mean that pointers, touchpads and such are not available for the few applications that do require them. -
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Checked C
Checked C is an extension to C that lets programmers write C code
Checked C is an extension to C that lets programmers write C code that is guaranteed by the compiler to be type-safe. The goal is to let people easily make their existing C code type-safe and eliminate entire classes of errors. Checked C does not address use-after-free errors. Checked C adds static and dynamic checking to C to detect or prevent common programming errors such as buffer overruns and out-of-bounds memory accesses. The goal of the project is to improve systems programming by making fundamental improvements to C. This repo contains sample code, the extension specification, and test code. The Checked C project is extending the C programming language so that programmers can write more secure and reliable C programs. The project is developing an extension to C called Checked C that adds checking to C to detect or prevent common programming errors such as buffer overruns, out-of-bounds memory accesses, and incorrect type casts. -
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Cosmopolitan
Build-once run-anywhere c library
Cosmopolitan Libc makes C a build-once run-anywhere language, like Java, except it doesn't need an interpreter or virtual machine. Instead, it reconfigures stock GCC and Clang to output a POSIX-approved polyglot format that runs natively on Linux + Mac + Windows + FreeBSD + OpenBSD + NetBSD + BIOS with the best possible performance and the tiniest footprint imaginable. Cosmopolitan can be compiled from source on any Linux distro. GNU make needs to be installed beforehand. This is a freestanding hermetic repository that bootstraps using a vendored static gcc9 executable. No further dependencies are required. -
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Deskhop
Fast Desktop Switching Device
DeskHop is an open-source hardware/software KVM device that seamlessly switches keyboard/mouse between two computers by dragging the cursor or via hotkeys. It’s plug‑and‑play, requiring no drivers, and provides galvanic isolation for secure multi-OS setups. -
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Driver samples for Windows 10
This repo contains driver samples prepared for use with Microsoft VS
These are the official Microsoft Windows Driver Kit (WDK) driver code samples for Windows 10. They provide a foundation for Universal Windows driver support of all hardware form factors, from phones to desktop PCs. Use these samples with Visual Studio 2019 and Windows Driver Kit (WDK) 10. Use Visual Studio 2019 and Windows Driver Kit (WDK) 10 to build, test, and deploy your drivers. With Windows 10, the driver development environment is integrated into Visual Studio. To get started, download the driver development kits and tools for Windows 10. Take a look at the compilation of the new and changed driver-related content for Windows 10. Areas of improvement include camera, print, display, Near Field Communication (NFC), WLAN, Bluetooth, and more. Write one driver that runs on Windows 10 for desktop editions, as well as other Windows 10 editions that share a common set of interfaces. -
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ElectronBot
ElectronBot is a mini desktop robot
ElectronBot is a desktop-scale robot platform designed for enthusiasts and makers, combining robotics, embedded systems, display, and gesture sensing into a compact mechanical “tool bot”. The project features six degrees of freedom (rotational axes) for arms, neck, and body, allowing expressive motion beyond simple head-tilt or arm-wave. It includes USB communication and a built-in display, enabling it to respond to host computer inputs and act as an interactive peripheral rather than just a static automaton. The creator provides full source materials—mechanical (3D printed or CNC parts), electronics (PCBs, custom boards), firmware and drivers—so someone can build or modify the robot themselves. The platform also integrates computer vision or gesture sensing (for example, keypoint detection of human pose) so the bot can respond dynamically to a person’s presence or movement. -
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Emojicode
World’s only programming language that’s bursting with emojis
Emojicode is an open-source, full-blown programming language consisting of emojis. As a multi-paradigm language, Emojicode features object orientation, optionals, generics, closures, and protocols. Emojicode compiles native machine code using lots of optimizations that make your code fast. Emojicode comes with a comprehensive set of default packages. And you can easily write your own. We believe that Emojis have expressive force. Let’s use that to make programming more fun and accessible. Emojicode is a straightforward language to learn, whatever background you have. Our documentation is known to be excellent and stuffed with walk-through guides and examples. Before you install Emojicode make sure you have a C++ compiler and linker installed. clang++ or g++ are fine, for instance. The Emojicode compiler can only link binaries if such a compiler is available. -
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Flash Linux 0.11 Talk
Annotated Unix system source code
flash-linux0.11-talk is an annotated walkthrough of the Linux 0.11 kernel that explains how a tiny Unix-like system boots, schedules, handles interrupts, and manages memory. The materials break down historically compact and dense code into digestible segments, with diagrams and call flows that trace execution from bootloader to user space. By focusing on a small, early kernel, the series reveals core OS concepts without the complexity of modern subsystems. It highlights how segmentation and paging cooperate, how system calls are dispatched, and how context switches and signals work in practice. The commentary ties C and assembly listings back to architecture specifics, making the hardware–software interface concrete. For learners, it serves as a guided tour that builds intuition for operating system design and prepares them to tackle contemporary kernels with better mental models. -
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Google Authenticator PAM Library
Example PAM module demonstrating two-factor authentication
google-authenticator-libpam is a Pluggable Authentication Module (PAM) that adds one-time passcodes to Unix and Linux logins using open OATH standards. It plugs into PAM stacks for services like SSH, su, or desktop display managers, prompting users for a time-based (TOTP) or counter-based (HOTP) code after their password. A lightweight enrollment program bootstraps each account by generating a secret, printing a QR code, and writing per-user configuration with safe file permissions. Because verification happens locally, codes work offline and do not depend on any Google service, which suits high-security and air-gapped environments. Administrators can tune skew tolerance, rate limiting, emergency scratch codes, and which PAM control flags enforce 2FA for specific users or groups. The project’s design favors simplicity and auditability, keeping the runtime small and the configuration explicit so it’s easy to review in production change control. -
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Google Toolbox for Mac
Google Toolbox for Mac
Google Toolbox for Mac (GTMSession) is a comprehensive collection of open source Objective-C utilities and frameworks developed by Google to support macOS and iOS application development. It consolidates reusable code components drawn from various internal Google projects, offering developers a wide range of tools for building efficient, maintainable Apple platform software. The library includes modules for networking, logging, testing, data handling, and user interface extensions, helping developers avoid reinventing common functionality. Its modular design allows developers to integrate only the components they need, improving project flexibility and performance. With well-documented interfaces and consistent coding standards, Google Toolbox for Mac serves as a reliable foundation for both small and large-scale applications. It continues to be widely used across open source and internal projects that target Apple ecosystems. -
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H2O
The optimized HTTP1, HTTP2, and HTTP3 server
H2O is a new generation HTTP server that provides quicker response to users with less CPU utilization when compared to older generation of web servers. Designed from ground-up, the server takes full advantage of HTTP/2 features including prioritized content serving and server push, promising outstanding experience to the visitors of your web site. Full support for dependency and weight-based prioritization with server-side tweaks. Static file serving, FastCGI, reverse proxy, scriptable using mruby (Rack-based), graceful restart and self-upgrade, BPF-based tracing tool (experimental), and more. H2O is a new generation HTTP server. Not only is it very fast, it also provides much quicker response to end-users when compared to older generations of HTTP servers. Written in C and licensed under the MIT License, it can also be used as a library. -
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HackSys Extreme Vulnerable Driver
HackSys Extreme Vulnerable Driver (HEVD) - Windows & Linux
The HackSys Extreme Vulnerable Driver (HEVD) is a Windows Kernel driver that is intentionally vulnerable. It has been developed for security researchers and enthusiasts to improve their skills in kernel-level exploitation. HEVD offers a range of vulnerabilities, from simple stack buffer overflows to more complex issues such as use-after-free, pool buffer overflows, and race conditions. This allows researchers to explore exploitation techniques for each implemented vulnerability. -
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Hermes
Hermes software environment manager
Hermes is a software environment manager used for installing and uninstalling collections of software. While similar to a package manager, Hermes operates differently by defining the entire software stack in a set of package definitions alongside the source code, ensuring strict reproducible control over the software environment. It offers an alternative approach to tools like Homebrew or Docker, with similarities to Nix and Guix. -
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HummusJS
Node.js module for high performance creation and modification of PDFs
PDFWriter latest release (4.5.12) includes support for fonts that contain Emojis. Notable examples for Emoji fonts are Windows Segoe UI emoji and Google Noto font. This means that writing text that include emojis will result in lovely colorful emojis, rather than black and white representations. PDFHummus is a fast and free PDF Writing, Parsing and Modification library. -
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Idris 2
A purely functional programming language with first class types
In type-driven development, types are tools for constructing programs. We treat the type as the plan for a program, and use the compiler and type checker as our assistant, guiding us to a complete program that satisfies the type. The more expressive the type is that we give up front, the more confidence we can have that the resulting program will be correct. In Idris, types are first-class constructs in the language. This means types can be passed as arguments to functions, and returned from functions just like any other value, such as numbers, strings, or lists. This is a small but powerful idea, enabling relationships to be expressed between values; for example, that two lists have the same length. Assumptions to be made explicit and checked by the compiler. For example, if you assume that a list is non-empty, Idris can ensure this assumption always holds before the program is run. -
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Inspektor Gadget
The eBPF tool and systems inspection framework for Kubernetes
Inspektor Gadget is a collection of tools (or gadgets) to debug and inspect Kubernetes resources and applications. It manages the packaging, deployment, and execution of eBPF programs in a Kubernetes cluster, including many based on BCC tools, as well as some developed specifically for use in Inspektor Gadget. It automatically maps low-level kernel primitives to high-level Kubernetes resources, making it easier and quicker to find the relevant information.
